Singapore Math - Page 3 of 7 - Worksheet Digital - Free Printable

Let’s solve each addition problem step by step. We’ll add the numbers column by column, starting from the right (ones place), and carry over if needed.

---

Problem 1:
```
25442
97745
495150
+ 432047
--------
```

Add step by step:

Start with ones place:
2 + 5 + 0 + 7 = 14 → write 4, carry 1

Tens:
4 + 4 + 5 + 4 + 1 (carry) = 18 → write 8, carry 1

Hundreds:
4 + 7 + 1 + 0 + 1 = 13 → write 3, carry 1

Thousands:
5 + 9 + 5 + 2 + 1 = 22 → write 2, carry 2

Ten thousands:
2 + 9 + 9 + 3 + 2 = 25 → write 5, carry 2

Hundred thousands:
0 + 0 + 4 + 4 + 2 = 10 → write 0, carry 1? Wait — let's align properly.

Actually, better to line them up vertically with proper places:

Write all numbers aligned:

```
25442
97745
495150
+ 432047
---------
```

Align by rightmost digit:

```
25442
97745
495150
+ 432047
-----------
```

Now add column by column from right:

Column 1 (ones): 2 + 5 + 0 + 7 = 14 → write 4, carry 1
Column 2 (tens): 4 + 4 + 5 + 4 + 1 = 18 → write 8, carry 1
Column 3 (hundreds): 4 + 7 + 1 + 0 + 1 = 13 → write 3, carry 1
Column 4 (thousands): 5 + 9 + 5 + 2 + 1 = 22 → write 2, carry 2
Column 5 (ten thousands): 2 + 9 + 9 + 3 + 2 = 25 → write 5, carry 2
Column 6 (hundred thousands): 0 + 0 + 4 + 4 + 2 = 10 → write 0, carry 1
Column 7 (millions): 0 + 0 + 0 + 0 + 1 = 1

So total = 1,052,384

Wait — let me double-check using calculator-style addition:

25442 + 97745 = 123,187
123,187 + 495,150 = 618,337
618,337 + 432,047 = 1,050,384

Oops! I made a mistake in alignment earlier.

Let’s do it correctly:

Numbers:

- 25,442
- 97,745
- 495,150
- 432,047

Add first two:
25,442 + 97,745 = 123,187

Add third:
123,187 + 495,150 = 618,337

Add fourth:
618,337 + 432,047 = ?

618,337
+432,047
= 1,050,384 ✔

So Problem 1 answer: 1,050,384

---

Problem 2:
```
206342
80477
39905
+ 578675
--------
```

Add step by step:

First: 206,342 + 80,477 = 286,819
Then: 286,819 + 39,905 = 326,724
Then: 326,724 + 578,675 = ?

326,724
+578,675
= 905,399 ✔

Check:

Ones: 2+7+5+5=19 → 9, carry 1
Tens: 4+7+0+7+1=19 → 9, carry 1
Hundreds: 3+4+9+6+1=23 → 3, carry 2
Thousands: 6+0+9+8+2=25 → 5, carry 2
Ten thousands: 0+8+3+7+2=20 → 0, carry 2
Hundred thousands: 2+0+0+5+2=9 → 9

So: 905,399 ✔

Problem 2 answer: 905,399

---

Problem 3:
```
36120
74018
650958
+ 203416
--------
```

Add:

36,120 + 74,018 = 110,138
110,138 + 650,958 = 761,096
761,096 + 203,416 = 964,512 ✔

Check columns:

Ones: 0+8+8+6=22 → 2, carry 2
Tens: 2+1+5+1+2=11 → 1, carry 1
Hundreds: 1+0+9+4+1=15 → 5, carry 1
Thousands: 6+4+0+3+1=14 → 4, carry 1
Ten thousands: 3+7+5+0+1=16 → 6, carry 1
Hundred thousands: 0+0+6+2+1=9 → 9

So: 964,512 ✔

Problem 3 answer: 964,512

---

Problem 4:
```
40611
52718
135638
+ 747381
--------
```

Add:

40,611 + 52,718 = 93,329
93,329 + 135,638 = 228,967
228,967 + 747,381 = 976,348 ✔

Check:

Ones: 1+8+8+1=18 → 8, carry 1
Tens: 1+1+3+8+1=14 → 4, carry 1
Hundreds: 6+7+6+3+1=23 → 3, carry 2
Thousands: 0+2+5+7+2=16 → 6, carry 1
Ten thousands: 4+5+3+4+1=17 → 7, carry 1
Hundred thousands: 0+0+1+7+1=9 → 9

So: 976,348 ✔

Problem 4 answer: 976,348

---

Problem 5:
```
46875
534823
35480
+ 239858
--------
```

Add:

46,875 + 534,823 = 581,698
581,698 + 35,480 = 617,178
617,178 + 239,858 = 857,036 ✔

Check:

Ones: 5+3+0+8=16 → 6, carry 1
Tens: 7+2+8+5+1=23 → 3, carry 2
Hundreds: 8+8+4+8+2=30 → 0, carry 3
Thousands: 6+4+5+9+3=27 → 7, carry 2
Ten thousands: 4+3+3+3+2=15 → 5, carry 1
Hundred thousands: 0+5+0+2+1=8 → 8

So: 857,036 ✔

Problem 5 answer: 857,036

---

Problem 6:
```
74509
34666
126923
+ 570812
--------
```

Add:

74,509 + 34,666 = 109,175
109,175 + 126,923 = 236,098
236,098 + 570,812 = 806,910 ✔

Check:

Ones: 9+6+3+2=20 → 0, carry 2
Tens: 0+6+2+1+2=11 → 1, carry 1
Hundreds: 5+6+9+8+1=29 → 9, carry 2
Thousands: 4+4+6+0+2=16 → 6, carry 1
Ten thousands: 7+3+2+7+1=20 → 0, carry 2
Hundred thousands: 0+0+1+5+2=8 → 8

So: 806,910 ✔

Problem 6 answer: 806,910

---

Problem 7:
```
63589
460346
45609
+ 205578
--------
```

Add:

63,589 + 460,346 = 523,935
523,935 + 45,609 = 569,544
569,544 + 205,578 = 775,122 ✔

Check:

Ones: 9+6+9+8=32 → 2, carry 3
Tens: 8+4+0+7+3=22 → 2, carry 2
Hundreds: 5+3+6+5+2=21 → 1, carry 2
Thousands: 3+0+5+5+2=15 → 5, carry 1
Ten thousands: 6+6+4+0+1=17 → 7, carry 1
Hundred thousands: 0+4+0+2+1=7 → 7

So: 775,122 ✔

Problem 7 answer: 775,122

---

Problem 8:
```
190679
64570
523689
+ 132670
--------
```

Add:

190,679 + 64,570 = 255,249
255,249 + 523,689 = 778,938
778,938 + 132,670 = 911,608 ✔

Check:

Ones: 9+0+9+0=18 → 8, carry 1
Tens: 7+7+8+7+1=30 → 0, carry 3
Hundreds: 6+5+6+6+3=26 → 6, carry 2
Thousands: 0+4+3+2+2=11 → 1, carry 1
Ten thousands: 9+6+2+3+1=21 → 1, carry 2
Hundred thousands: 1+0+5+1+2=9 → 9

So: 911,608 ✔

Problem 8 answer: 911,608

---

Final Answer:
1,050,384
905,399
964,512
976,348
857,036
806,910
775,122
911,608