Secret Easter Message Three-Digit Addition Spring - Free Printable

Let’s solve this step by step.

We have a decoder table with math problems (addition) and letters assigned to each answer. Then we have “The Secret Message” — a list of numbers that we need to match to the answers in the decoder to find the corresponding letters. Once we replace each number with its letter, we’ll get the secret message.

First, let’s solve all the addition problems in “The Decoder” and write down which letter goes with which sum.

---

Left Column:

464 + 708 = 1172 → A
819 + 491 = 1310 → B
694 + 584 = 1278 → C
357 + 124 = 481 → D
527 + 581 = 1108 → E
598 + 782 = 1380 → F
406 + 868 = 1274 → G

Wait — hold on! Let me double-check these:

- 464 + 708:
400+700=1100, 64+8=72 → 1172 ✔
- 819 + 491:
800+400=1200, 19+91=110 → 1310 ✔
- 694 + 584:
600+500=1100, 94+84=178 → 1278 ✔
- 357 + 124:
300+100=400, 57+24=81 → 481 ✔
- 527 + 581:
500+500=1000, 27+81=108 → 1108 ✔
- 598 + 782:
500+700=1200, 98+82=180 → 1380 ✔
- 406 + 868:
400+800=1200, 6+68=74 → 1274 ✔

Good.

---

Second Column:

830 + 443 = 1273 → H
474 + 306 = 780 → I
451 + 974 = 1425 → J
736 + 151 = 887 → K
948 + 978 = 1926 → L
464 + 560 = 1024 → M
945 + 512 = 1457 → N

Check:

- 830 + 443: 800+400=1200, 30+43=73 → 1273 ✔
- 474 + 306: 400+300=700, 74+6=80 → 780 ✔
- 451 + 974: 400+900=1300, 51+74=125 → 1425 ✔
- 736 + 151: 700+100=800, 36+51=87 → 887 ✔
- 948 + 978: 900+900=1800, 48+78=126 → 1926 ✔
- 464 + 560: 400+500=900, 64+60=124 → 1024 ✔
- 945 + 512: 900+500=1400, 45+12=57 → 1457 ✔

Good.

---

Third Column:

169 + 923 = 1092 → O
947 + 171 = 1118 → P
757 + 964 = 1721 → Q
974 + 469 = 1443 → R
661 + 938 = 1599 → S
685 + 692 = 1377 → T
684 + 884 = 1568 → U

Check:

- 169 + 923: 100+900=1000, 69+23=92 → 1092 ✔
- 947 + 171: 900+100=1000, 47+71=118 → 1118 ✔
- 757 + 964: 700+900=1600, 57+64=121 → 1721 ✔
- 974 + 469: 900+400=1300, 74+69=143 → 1443 ✔
- 661 + 938: 600+900=1500, 61+38=99 → 1599 ✔
- 685 + 692: 600+600=1200, 85+92=177 → 1377 ✔
- 684 + 884: 600+800=1400, 84+84=168 → 1568 ✔

Good.

---

Fourth Column:

139 + 282 = 421 → V
676 + 716 = 1392 → W
906 + 490 = 1396 → X
268 + 642 = 910 → Y
870 + 898 = 1768 → Z
720 + 853 = 1573 → - (dash)
186 + 885 = 1071 → - (dash)

Check:

- 139 + 282: 100+200=300, 39+82=121 → 421 ✔
- 676 + 716: 600+700=1300, 76+16=92 → 1392 ✔
- 906 + 490: 900+400=1300, 6+90=96 → 1396 ✔
- 268 + 642: 200+600=800, 68+42=110 → 910 ✔
- 870 + 898: 800+800=1600, 70+98=168 → 1768 ✔
- 720 + 853: 700+800=1500, 20+53=73 → 1573 ✔
- 186 + 885: 100+800=900, 86+85=171 → 1071 ✔

Perfect.

Now let’s make a quick lookup table for easy reference:

Sum → Letter

421 → V
481 → D
780 → I
887 → K
910 → Y
1024 → M
1071 → -
1092 → O
1108 → E
1118 → P
1172 → A
1273 → H
1274 → G
1278 → C
1310 → B
1377 → T
1380 → F
1392 → W
1396 → X
1425 → J
1443 → R
1457 → N
1568 → U
1573 → -
1599 → S
1721 → Q
1768 → Z
1926 → L

Also note: 1071 and 1573 are both mapped to “-”, so they represent spaces or dashes.

---

Now, look at “The Secret Message” — it’s a long list of numbers. We need to go one by one and replace each number with its letter.

Let’s break it into lines as shown:

Line 1:
1258 1108 421 1108 1440 → Wait, 1440? That’s not in our decoder!

Hold on — did I miss something?

Looking back at the decoder… none of the sums equal 1440. Did I miscalculate?

Wait — let me check if any problem equals 1440.

Look again:

In third column: 974 + 469 = 1443 → R
Is there a 1440? No.

But wait — maybe I made a mistake copying the secret message?

Looking at the original image description (even though I’m not supposed to mention it), the user provided text says:

“The Secret Message” has:

1258 1108 421 1108 1440
910 1108 1387
...

Wait — 1258? Not in my list either.

This is a problem. Maybe I missed some decoder entries?

Wait — let me re-examine the decoder columns.

Actually, looking back — perhaps I misread the decoder layout.

Wait — the decoder is arranged in four columns, but maybe the letters are assigned per row across?

No — the way it's written, each box has a sum and a letter next to it. For example:

First box: 464 + 708 = ___ → A

So each equation maps to one letter.

But now I see — in the fourth column, last two are mapped to “-”, meaning space.

But still, numbers like 1258, 1440, 1387 don’t appear in my calculated sums.

Did I skip any equations?

Let me count how many equations there are.

Each column has 7 rows → 4 columns × 7 = 28 equations.

I listed 28 sums. But the secret message contains numbers not in that list.

That means — I must have made an error in calculation or missed an entry.

Wait — let me check the original problem again carefully.

Perhaps I misadded some.

Let me recalculate ALL decoder sums very carefully, writing them out fully.

---

Column 1:

1. 464 + 708
464
+708
----
1172 → A ✔

2. 819 + 491
819
+491
----
1310 → B ✔

3. 694 + 584
694
+584
----
1278 → C ✔

4. 357 + 124
357
+124
----
481 → D ✔

5. 527 + 581
527
+581
----
1108 → E ✔

6. 598 + 782
598
+782
----
1380 → F ✔

7. 406 + 868
406
+868
----
1274 → G ✔

Column 2:

8. 830 + 443
830
+443
----
1273 → H ✔

9. 474 + 306
474
+306
----
780 → I ✔

10. 451 + 974
451
+974
----
1425 → J ✔

11. 736 + 151
736
+151
----
887 → K ✔

12. 948 + 978
948
+978
----
1926 → L ✔

13. 464 + 560
464
+560
----
1024 → M ✔

14. 945 + 512
945
+512
----
1457 → N ✔

Column 3:

15. 169 + 923
169
+923
----
1092 → O ✔

16. 947 + 171
947
+171
----
1118 → P ✔

17. 757 + 964
757
+964
----
1721 → Q ✔

18. 974 + 469
974
+469
----
1443 → R ✔

19. 661 + 938
661
+938
----
1599 → S ✔

20. 685 + 692
685
+692
----
1377 → T ✔

21. 684 + 884
684
+884
----
1568 → U ✔

Column 4:

22. 139 + 282
139
+282
----
421 → V ✔

23. 676 + 716
676
+716
----
1392 → W ✔

24. 906 + 490
906
+490
----
1396 → X ✔

25. 268 + 642
268
+642
----
910 → Y ✔

26. 870 + 898
870
+898
----
1768 → Z ✔

27. 720 + 853
720
+853
----
1573 → - ✔

28. 186 + 885
186
+885
----
1071 → - ✔

Still no 1258, 1440, 1387, etc.

Wait — perhaps the secret message uses the same sums but I need to realize that some numbers might be typos or I misread.

Alternatively — maybe the decoder is meant to be used differently? Like, the letter corresponds to the sum, but perhaps the secret message numbers are to be matched even if not exact? No, that doesn't make sense.

Another idea: perhaps I need to consider that the "decoder" includes the answers, and the secret message numbers are those answers, so I should just map them directly.

But 1258 isn't in my list.

Unless... did I miscalculate one?

Let me try to see what 1258 could be.

What two numbers add to 1258? Not helpful.

Perhaps the first number in the secret message is 1258, but in the decoder, is there a sum close to that?

1273, 1274, 1278 — all around there.

1258 is 15 less than 1273.

Not matching.

Wait — let's look at the secret message again as given in the user's text:

"The Secret Message" section has:

1258 1108 421 1108 1440
910 1108 1387
1259 1118 1440 780 1258 1274 1387 780 824 1108 1387
1392 1170 1259 1224 1170
1259 1118 1440 780 1258 1274 1387 780 824 1108 1387
1387 1293 1108
1310 1568 481 1259
1380 1092 1440 1274 1092 1387
1387 1092
1310 1927 1092 1092 824 1071

Many of these numbers are not in my decoder sums.

For example:
- 1258
- 1440
- 1387
- 1259
- 824
- 1170
- 1224
- 1293
- 1927

None of these are in my list of 28 sums.

This suggests that either:
1. I have a calculation error in the decoder.
2. The decoder has more entries or different assignments.
3. The secret message numbers are to be interpreted differently.

Wait — perhaps the "decoder" is not only the sums I calculated, but the letters are assigned to the sums, and the secret message uses those sums, but maybe I need to include the possibility that some sums are repeated or something.

Another thought: perhaps the decoder table is to be read as the answer to the addition is the key, and the letter is given, but maybe for the secret message, we use the letter corresponding to the sum, and if a number appears in the secret message that isn't in the decoder, it's a mistake.

But that can't be.

Let me try to calculate what 1387 would be.

Is there an addition that gives 1387?

For example, in column 3, 685 + 692 = 1377, which is T.

1387 is 10 more.

Not matching.

Perhaps I misread the decoder.

Let me look back at the user's initial description.

The user said: "Complete the decoder then use it to decipher the secret message."

And the decoder has boxes with additions and letters.

But in the text provided, for example, in the fourth column, the last two are mapped to "-", which likely means space.

But still, the numbers in the secret message don't match.

Unless... perhaps the secret message numbers are the results of the additions, and I need to find which addition gives that result, but since I have only 28, and the secret message has many numbers, some must repeat.

But 1258 is not among my 28.

Let me list all my decoder sums again:

From above:

1172, 1310, 1278, 481, 1108, 1380, 1274, // col1
1273, 780, 1425, 887, 1926, 1024, 1457, // col2
1092, 1118, 1721, 1443, 1599, 1377, 1568, // col3
421, 1392, 1396, 910, 1768, 1573, 1071 // col4

Sort them to see if any match the secret message numbers.

Sorted decoder sums:

421, 481, 780, 887, 910, 1024, 1071, 1092, 1108, 1118, 1172, 1273, 1274, 1278, 1310, 1377, 1380, 1392, 1396, 1425, 1443, 1457, 1568, 1573, 1599, 1721, 1768, 1926

Now, secret message numbers include:

1258, 1108, 421, 1108, 1440, 910, 1108, 1387, 1259, 1118, 1440, 780, 1258, 1274, 1387, 780, 824, 1108, 1387, 1392, 1170, 1259, 1224, 1170, 1259, 1118, 1440, 780, 1258, 1274, 1387, 780, 824, 1108, 1387, 1387, 1293, 1108, 1310, 1568, 481, 1259, 1380, 1092, 1440, 1274, 1092, 1387, 1387, 1092, 1310, 1927, 1092, 1092, 824, 1071

Compare to decoder sums:

Matches found:
- 1108 → E
- 421 → V
- 910 → Y
- 780 → I
- 1274 → G
- 1392 → W
- 1118 → P
- 1310 → B
- 1568 → U
- 481 → D
- 1380 → F
- 1092 → O
- 1071 → -

But many numbers like 1258, 1440, 1387, 1259, 824, 1170, 1224, 1293, 1927 are not in the decoder sums.

This is a problem.

Perhaps I have a fundamental misunderstanding.

Another idea: maybe the "decoder" is not the sums, but the letters are to be used based on the position or something else.

Or perhaps the secret message numbers are to be added or processed differently.

Let's think differently.

Perhaps the decoder is complete, and the secret message uses only the sums that are in the decoder, and the other numbers are errors or I need to ignore them, but that doesn't make sense.

Maybe the student is expected to calculate the decoder, and then for the secret message, each number corresponds to a letter based on the decoder, and if a number isn't in the decoder, it's a space or something.

But 1258 is not in decoder.

Unless... let's calculate what 1258 could be.

Suppose 1258 is a typo, and it's meant to be 1278 or 1274.

1278 is C, 1274 is G.

Similarly, 1440 might be 1443 (R).

1387 might be 1377 (T) or 1380 (F).

1259 might be 1273 (H) or 1274 (G).

824 — not close to any.

1170 — not in list.

1224 — not in list.

1293 — not in list.

1927 — close to 1926 (L).

1071 is in list, mapped to -.

Perhaps the intended mapping is:

For numbers not in decoder, round to nearest or something, but that's not standard.

Another possibility: perhaps the decoder has more entries, or I missed some.

Let me count the number of equations in the decoder.

In the user's text, it's described as four columns, each with 7 rows, so 28.

But in the secret message, there are many numbers, so likely some are repeats, but the unique ones include values not in decoder.

Perhaps the "decoder" is to be completed by the student, and the letters are given, but the sums are to be calculated, and then used.

But still, the secret message numbers must match the sums.

Unless... let's look at the first few numbers of the secret message: 1258, 1108, 421, 1108, 1440

1108 is E, 421 is V, so if 1258 and 1440 were known, but they're not.

Perhaps 1258 is 1278 - 20, but not helpful.

I recall that in some such puzzles, the decoder might have the sum, and the letter, and the secret message uses the sum to get the letter, but here the sums don't match.

Perhaps I miscalculated one of the decoder sums.

Let me try to see if 1258 can be obtained.

For example, is there an addition like 629 + 629 = 1258? But not in decoder.

Or 500 + 758, etc.

Not helping.

Another idea: perhaps the "decoder" is not the addition results, but the letters are assigned to the addends or something, but that doesn't make sense.

Let's read the instruction: "Complete the decoder then use it to decipher the secret message."

And "The Decoder" has boxes with "464 + 708 = ___ A" etc, so clearly the blank is to be filled with the sum, and that sum corresponds to the letter.

Then "The Secret Message" has numbers, which should be those sums.

So why the discrepancy?

Perhaps in the original image, the decoder has different numbers, or the secret message has different numbers.

Since I can't see the image, and the user provided text, perhaps there's a typo in the user's transcription.

For example, in the secret message, "1258" might be "1278", "1440" might be "1443", "1387" might be "1377" or "1380", "1259" might be "1273" or "1274", "824" might be "887" or "1024", "1170" might be "1172", "1224" might be "1274", "1293" might be "1273" or "1310", "1927" might be "1926".

Let me assume that and see if it makes sense.

For example, suppose:

1258 -> 1278 (C) [since 1278 is C]
1440 -> 1443 (R) [1443 is R]
1387 -> 1377 (T) or 1380 (F)? 1377 is T, 1380 is F.
1259 -> 1273 (H) or 1274 (G)?
824 -> 887 (K) or 1024 (M)?
1170 -> 1172 (A)
1224 -> 1274 (G)
1293 -> 1273 (H) or 1310 (B)
1927 -> 1926 (L)

Let's try to decode the first line with assumptions.

Secret message line 1: 1258 1108 421 1108 1440

Assume:
1258 -> 1278 -> C
1108 -> E
421 -> V
1108 -> E
1440 -> 1443 -> R

So "CEVER" — not a word.

If 1258 -> 1274 -> G, then "GEVER" — not good.

If 1258 -> 1172 -> A, then "AEVER" — not good.

Perhaps 1258 is 1258, and it's not in decoder, so skip, but that doesn't help.

Another approach: perhaps the decoder is correct, and the secret message numbers are to be matched to the closest or something, but that's not reliable.

Let's look at the last part of the secret message: "Happy Easter from Math-Drills.com!" is given at the bottom, so the secret message should spell that or something similar.

"Happy Easter" has letters H,A,P,P,Y, ,E,A,S,T,E,R

From decoder:
H = 1273
A = 1172
P = 1118
Y = 910
E = 1108
S = 1599
T = 1377
R = 1443

Space = 1071 or 1573

So "Happy Easter" would be: 1273, 1172, 1118, 1118, 910, 1071, 1108, 1172, 1599, 1377, 1108, 1443

But in the secret message, we have sequences like 1380, 1092, 1440, etc.

1380 is F, 1092 is O, 1440 might be R, so "FOR" — which is in "from".

"from" : F=1380, R=1443, O=1092, M=1024

So 1380, 1443, 1092, 1024

In secret message, we have "1380 1092 1440 1274 1092 1387" — so 1380, 1092, 1440 (assume 1443), 1274 (G), 1092 (O), 1387 (assume 1377=T) — so "FOGOT" or something, not "FROM".

1274 is G, not M.

M is 1024.

So not matching.

Perhaps "Math-Drills.com" but that's long.

Another idea: perhaps the secret message is "Happy Easter" and the numbers correspond, but let's see the beginning.

Perhaps I need to accept that some numbers are typos and proceed with the matches I have.

Let's list the secret message numbers and map what I can.

Take the first few:

1258 - ?
1108 - E
421 - V
1108 - E
1440 - ?
910 - Y
1108 - E
1387 - ?
1259 - ?
1118 - P
1440 - ?
780 - I
1258 - ?
1274 - G
1387 - ?
780 - I
824 - ?
1108 - E
1387 - ?
1392 - W
1170 - ?
1259 - ?
1224 - ?
1170 - ?
1259 - ?
1118 - P
1440 - ?
780 - I
1258 - ?
1274 - G
1387 - ?
780 - I
824 - ?
1108 - E
1387 - ?
1387 - ?
1293 - ?
1108 - E
1310 - B
1568 - U
481 - D
1259 - ?
1380 - F
1092 - O
1440 - ?
1274 - G
1092 - O
1387 - ?
1387 - ?
1092 - O
1310 - B
1927 - ?
1092 - O
1092 - O
824 - ?
1071 - -

Now, if I assume that:
- 1258 -> 1278 -> C (since 1278 is C, and 1258 is close)
- 1440 -> 1443 -> R
- 1387 -> 1377 -> T (1377 is T)
- 1259 -> 1273 -> H (1273 is H)
- 824 -> 887 -> K (887 is K)
- 1170 -> 1172 -> A
- 1224 -> 1274 -> G (1274 is G)
- 1293 -> 1273 -> H or 1310 -> B, say B
- 1927 -> 1926 -> L

Let's try to decode the first line: 1258 1108 421 1108 1440 -> C E V E R

"CEVER" not a word.

If 1258 -> 1274 -> G, then "GEVER" not good.

If 1258 -> 1172 -> A, "AEVER" not good.

Perhaps 1258 is 1258, and it's 'H' or something.

Another thought: perhaps the decoder has a sum that I miscalculated.

Let me calculate 629 + 629 = 1258, but not in decoder.

Or 500 + 758, etc.

Perhaps in the decoder, one of the additions is different.

For example, in column 1, 406 + 868 = 1274, but if it were 406 + 852 = 1258, but it's not.

I think there might be a typo in the user's provided text for the secret message or decoder.

Perhaps "1258" is "1278", "1440" is "1443", "1387" is "1377", "1259" is "1273", "824" is "887", "1170" is "1172", "1224" is "1274", "1293" is "1273", "1927" is "1926".

Let me try that.

So assume:
1258 -> 1278 -> C
1440 -> 1443 -> R
1387 -> 1377 -> T
1259 -> 1273 -> H
824 -> 887 -> K
1170 -> 1172 -> A
1224 -> 1274 -> G
1293 -> 1273 -> H
1927 -> 1926 -> L

Now decode the secret message.

Line 1: 1258 1108 421 1108 1440 -> C E V E R

Still "CEVER" — not good.

Perhaps 1258 -> 1274 -> G, then "GEVER" — not good.

Another idea: perhaps the first number is 1258, but in context, it might be "H" if 1258 is close to 1273, but 1273 is H, 1258 is 15 less.

Let's look at the whole thing.

Perhaps the secret message is "Happy Easter" and the numbers are for that.

"Happy" : H=1273, A=1172, P=1118, P=1118, Y=910

In secret message, we have later: 1310 1568 481 1259 — 1310=B, 1568=U, 481=D, 1259=H (assumed) -> "BUDH" not "Happy".

Earlier: 1380 1092 1440 1274 1092 1387 -> F O R G O T — "forgot" but should be "from".

1274 is G, not M.

M is 1024.

So not.

Perhaps "Math-Drills" but M=1024, A=1172, T=1377, H=1273, - =1071, D=481, R=1443, I=780, L=1926, L=1926, S=1599

Not matching.

I recall that at the bottom it says "Happy Easter from Math-Drills.com!" so perhaps the secret message is that phrase.

Let me try to see if the numbers match when I use the correct mappings.

For "Happy Easter from Math-Drills.com!"

But it's long, and the secret message has specific numbers.

Perhaps the secret message is "Easter" or something.

Let's take a sequence that might be "Easter": E=1108, A=1172, S=1599, T=1377, E=1108, R=1443

In secret message, we have "1108 1387" etc, not matching.

Another sequence: "1310 1568 481 1259" -> B U D H — not good.

"1380 1092 1440 1274 1092 1387" -> F O R G O T — "forgot"

Then "1387 1293 1108" -> T H E — if 1293->H, 1108->E, so "THE"

Then "1310 1568 481 1259" -> B U D H — not "from"

"1380 1092 1440 1274 1092 1387" again "FORGOT"

Then "1387 1092" -> T O

Then "1310 1927 1092 1092 824 1071" -> B L O O K - — "book " if 824->K, 1071-> space

"BOOK "

But earlier "FORGOT THE BOOK " — that could be part of a message.

Then before that, "1259 1118 1440 780 1258 1274 1387 780 824 1108 1387" -> H P R I C G T I K E T — "HPRICTIKET" not good.

With assumptions:
1259->H, 1118->P, 1440->R, 780->I, 1258->C, 1274->G, 1387->T, 780->I, 824->K, 1108->E, 1387->T -> "HPRICGTIKET" not a word.

If 1258->G, then "HPRIGTIKET" not good.

Perhaps 1258->A, "HPRIAGTIKET" not good.

I think I need to give up and assume that the intended mapping is with the decoder sums, and the secret message numbers are those sums, so perhaps in the original, the numbers are different.

Perhaps for the sake of completing, I'll use the decoder as is, and for numbers not in decoder, use the closest or skip, but that's not accurate.

Another idea: perhaps the "decoder" is to be used by taking the sum, and the letter is given, but for the secret message, the numbers are the sums, and I need to output the letters, and if a number is not in the decoder, it's an error, but since the task is to decipher, likely all numbers are in the decoder.

Let's count how many unique numbers in secret message.

From the list: 1258, 1108, 421, 1440, 910, 1387, 1259, 1118, 780, 1274, 824, 1392, 1170, 1224, 1293, 1310, 1568, 481, 1380, 1092, 1071, 1927

Unique: 1258, 1108, 421, 1440, 910, 1387, 1259, 1118, 780, 1274, 824, 1392, 1170, 1224, 1293, 1310, 1568, 481, 1380, 1092, 1071, 1927 — 22 unique.

Decoder has 28 sums, so overlap should be high, but only some match.

Matches: 1108, 421, 910, 780, 1274, 1392, 1118, 1310, 1568, 481, 1380, 1092, 1071 — 13 matches.

Missing: 1258, 1440, 1387, 1259, 824, 1170, 1224, 1293, 1927 — 9 missing.

Perhaps in the decoder, there are additional entries or I missed.

Let's look back at the user's text for the decoder.

In the fourth column, last two are "720 + 853 = ___ -" and "186 + 885 = ___ -" , so two dashes.

But perhaps the dash is for space, and the sum is 1573 and 1071, both mapped to -.

But still.

Perhaps for the secret message, when a number is not in decoder, it's a space, but 1258 is not space.

I think I need to conclude that with the given information, and assuming that the numbers in the secret message correspond to the decoder sums, and for those not present, they are typos, and based on common phrases, the message is "Happy Easter" or something.

Perhaps the secret message is "Easter Egg Hunt" or "Happy Easter".

Let's try to see the last part: "1310 1927 1092 1092 824 1071" -> B L O O K - if 1927->L, 824->K, 1071-> space, so "BOOK "

Before that "1387 1092" -> T O

Before that "1380 1092 1440 1274 1092 1387" -> F O R G O T

So "FORGOT TO BOOK " — not sensible.

"1310 1568 481 1259" -> B U D H — "budh" not good.

Perhaps "1259" is "1273" -> H, so "BUDH" -> "BUD H" not good.

Another sequence: "1259 1118 1440 780 1258 1274 1387 780 824 1108 1387" -> H P R I C G T I K E T — if we take "HAPPY" but H=1273, A=1172, not matching.

Perhaps it's "SECRET EASTER MESSAGE" or something.

I recall that the title is "Secret Easter Message (C)", so perhaps the message is related.

Perhaps the secret message is "Happy Easter from Math-Drills.com!" and the numbers are for that.

Let me calculate the sums for "Happy Easter from Math-Drills.com!" but it's long, and the secret message has specific numbers.

Perhaps for the sake of time, I'll assume that the decoder is correct, and the secret message numbers are to be mapped as per the decoder, and for numbers not in decoder, they are errors, but since the task is to decipher, likely in the original, the numbers match.

Perhaps in the user's text, "1258" is "1278", "1440" is "1443", etc.

Let me try to decode with the following assumptions:

- 1258 -> 1278 -> C
- 1440 -> 1443 -> R
- 1387 -> 1377 -> T
- 1259 -> 1273 -> H
- 824 -> 887 -> K
- 1170 -> 1172 -> A
- 1224 -> 1274 -> G
- 1293 -> 1273 -> H
- 1927 -> 1926 -> L

Now let's decode the entire secret message.

Write the secret message as a string of numbers, then map.

From user's text:

Line 1: 1258 1108 421 1108 1440 -> C E V E R

Line 2: 910 1108 1387 -> Y E T

Line 3: 1259 1118 1440 780 1258 1274 1387 780 824 1108 1387 -> H P R I C G T I K E T

Line 4: 1392 1170 1259 1224 1170 -> W A H G A

Line 5: 1259 1118 1440 780 1258 1274 1387 780 824 1108 1387 -> H P R I C G T I K E T (same as line 3)

Line 6: 1387 1293 1108 -> T H E

Line 7: 1310 1568 481 1259 -> B U D H

Line 8: 1380 1092 1440 1274 1092 1387 -> F O R G O T

Line 9: 1387 1092 -> T O

Line 10: 1310 1927 1092 1092 824 1071 -> B L O O K -

Now put together:

CEVER YET HPRICGTIKET WAHGA HPRICGTIKET THE BUDH FORGOT TO BOOK

This doesn't make sense.

Perhaps "HPRICGTIKET" is "HAPPY EASTER" but not matching.

Another idea: perhaps "1258" is "1172" -> A, "1440" is "1443" -> R, etc.

Let's try 1258 -> 1172 -> A

Then line 1: A E V E R

Still not good.

Perhaps the first number is for "H" .

Let's look for "HAPPY" : H=1273, A=1172, P=1118, P=1118, Y=910

In secret message, we have "1118" for P, "910" for Y, but not together with H and A.

In line 3: 1259 1118 1440 780 ... -> if 1259->H, 1118->P, 1440->R, not A.

Unless 14