Using 2nd Grade Math Worksheets to Teach 3-Digit Subtraction With ... - Free Printable

Let's solve this fun "Subtraction Shopping" puzzle step by step!

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Step 1: Understand the Task

We are given a grid of subtraction problems (3-digit numbers, no regrouping). Each problem has a letter associated with it. After solving each subtraction, we will get a number. Then, we use those numbers to match them with the riddle at the bottom.

The riddle is:

> "What did the duck say after he went shopping?"

At the bottom, there's a clue with numbers and blanks:

```
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
421 315 311 101 311 400 363 142 616 536 101 552 552
```

Our goal:
1. Solve each subtraction problem.
2. Match the result to a letter.
3. Use the letters to decode the riddle.

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Step 2: Solve Each Subtraction Problem

We’ll go through each one carefully (no regrouping, so all digits subtract cleanly).

#### Row 1:
- m: 486 - 344 = 142
- $: 789 - 175 = 614
- p: 889 - 468 = 421
- u: 497 - 182 = 315

#### Row 2:
- $: 857 - 547 = 310
- o: 744 - 344 = 400
- $: 975 - 565 = 410
- l: 896 - 344 = 552

#### Row 3:
- t: 736 - 425 = 311
- $: 983 - 152 = 831
- y: 839 - 223 = 616
- n: 689 - 326 = 363

#### Row 4:
- $: 755 - 240 = 515
- i: 489 - 388 = 101
- $: 486 - 133 = 353
- b: 677 - 141 = 536

---

Step 3: Create a Letter-to-Number Map

Now let’s list each letter and its corresponding answer:

| Letter | Answer |
|--------|--------|
| m | 142 |
| $ | 614 |
| p | 421 |
| u | 315 |
| $ | 310 |
| o | 400 |
| $ | 410 |
| l | 552 |
| t | 311 |
| $ | 831 |
| y | 616 |
| n | 363 |
| $ | 515 |
| i | 101 |
| $ | 353 |
| b | 536 |

But note: The $ symbol appears multiple times — that means different answers for different items. So we must treat each as unique based on position.

Wait! Actually, in the puzzle, the same $ symbol might represent different values, but they are just placeholders. We need to look at which number matches which letter.

So better approach: Let's collect all unique results and see which letters go with which.

Let’s list each letter → result pair:

- m → 142
- $ → 614 (top middle)
- p → 421
- u → 315
- $ → 310 (middle left)
- o → 400
- $ → 410 (middle right)
- l → 552
- t → 311
- $ → 831 (bottom middle-left)
- y → 616
- n → 363
- $ → 515 (bottom left)
- i → 101
- $ → 353 (bottom middle-right)
- b → 536

Now, we can extract the results and their corresponding letters.

Let’s list only the unique numbers and the letters that go with them.

But wait — the riddle at the bottom uses numbers like 421, 315, 311, 101, 400, 363, 142, 616, 536, 552.

Let’s match these to the letters from our solved problems.

We need to find which letter corresponds to which number.

From above:

- 142 → m
- 421 → p
- 315 → u
- 311 → t
- 101 → i
- 400 → o
- 363 → n
- 616 → y
- 536 → b
- 552 → l

Also:
- 410 → $ (but not used in riddle)
- 614 → $ (not used)
- 831 → $ (not used)
- 515 → $ (not used)
- 353 → $ (not used)

So the riddle clues use only these numbers:

> 421, 315, 311, 101, 311, 400, 363, 142, 616, 536, 101, 552, 552

Let’s map each number to its letter:

- 421 → p
- 315 → u
- 311 → t
- 101 → i
- 400 → o
- 363 → n
- 142 → m
- 616 → y
- 536 → b
- 552 → l

Now plug into the riddle:

```
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
421 315 311 101 311 400 363 142 616 536 101 552 552
```

Break it down:

1. 421 → p, 315 → u, 311 → t → put
2. 101 → i, 311 → t → it
3. 400 → o, 363 → n → on
4. 142 → m, 616 → y → my
5. 536 → b, 101 → i, 552 → l, 552 → l → bill

So the sentence is:

> Put it on my bill.

But wait — that doesn't sound like a duck joke.

Wait — let’s double-check the spacing.

Look at the blank lines:

There are five groups:

1. ___ ___ ___ → 421 315 311 → p u t → put
2. ___ ___ → 101 311 → i t → it
3. ___ ___ → 400 363 → o n → on
4. ___ ___ → 142 616 → m y → my
5. ___ ___ ___ ___ → 536 101 552 552 → b i l l → bill

So the full phrase is:

> Put it on my bill.

But that’s not funny. Maybe it's a pun?

Wait — maybe the duck said: "I'm quacked out!" or something? But we have "Put it on my bill."

Hmm.

But let’s check if we made a mistake.

Wait — what about the dollar signs? Are they meant to be part of the word?

No — the dollar sign is just a placeholder for a price tag. The actual letters are the ones labeled: m, p, u, o, l, t, y, n, i, b.

And we have:

- p → 421
- u → 315
- t → 311
- i → 101
- o → 400
- n → 363
- m → 142
- y → 616
- b → 536
- l → 552

So the sequence:

- 421 → p
- 315 → u
- 311 → t → put
- 101 → i
- 311 → t → it
- 400 → o
- 363 → n → on
- 142 → m
- 616 → y → my
- 536 → b
- 101 → i
- 552 → l
- 552 → l → bill

So: "Put it on my bill."

That seems correct.

But why would a duck say that?

Ah! Wait — maybe it's a pun on "quack" and "check"?

But here, it’s a duck going shopping, and the punchline is "Put it on my bill."

Wait — perhaps the joke is that ducks don’t pay bills — or maybe it’s a play on words?

Alternatively, could it be a typo?

Wait — let’s recheck the last group: 536 101 552 552 → b i l l → bill

Yes.

But let’s double-check all subtractions to make sure we didn’t make a mistake.

---

Double-Check Key Subtractions

Let’s verify the ones we used:

- 486 - 344 = 142 → ✔
- 889 - 468 = 421 → ✔
- 497 - 182 = 315 → ✔
- 736 - 425 = 311 → ✔
- 489 - 388 = 101 → ✔
- 744 - 344 = 400 → ✔
- 689 - 326 = 363 → ✔
- 839 - 223 = 616 → ✔
- 677 - 141 = 536 → ✔
- 896 - 344 = 552 → ✔

All correct.

So the answer is:

> "Put it on my bill."

But is that the joke?

Wait — maybe the duck said: "Quack it up!" or something?

But no — the math leads us to "Put it on my bill."

Perhaps the humor is that ducks don’t have bills (money), but they *do* have beaks — called "bills".

Ah! That’s the pun!

Ducks have bills (beaks), not credit cards.

So the duck says: "Put it on my bill." — meaning "Charge it to my beak!" — a pun on "bill" meaning both a beak and a payment bill.

So the joke is:

> "What did the duck say after he went shopping?"
> "Put it on my bill!" — because ducks have bills (beaks), so he wants to charge it to his beak!

😄

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✔ Final Answer:

"Put it on my bill."

It's a pun — the duck's bill (beak) is being used as a payment bill. Clever!

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🔤 Step-by-step decoding:

| Number | Letter |
|--------|--------|
| 421 | p |
| 315 | u |
| 311 | t |
| 101 | i |
| 400 | o |
| 363 | n |
| 142 | m |
| 616 | y |
| 536 | b |
| 552 | l |

Sequence:

- 421 315 311 → p u t → put
- 101 311 → i t → it
- 400 363 → o n → on
- 142 616 → m y → my
- 536 101 552 552 → b i l l → bill

✔ Final riddle answer: "Put it on my bill." 🦆💸