Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 8 · 40 sums

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

1. 1.364 − 321 =
2. 2.498 + 177 =
3. 3.426 − ? = 172
4. 4.448 + ? = 840
5. 5.319 − ? = 206
6. 6.355 − 342 =
7. 7.A train has 320 people in the front coaches and 561 people in the back coaches. How many people are on the train?
8. 8.602 − 230 =
9. 9.? + 344 = 937
10. 10.A school has 366 children. 209 of them are girls. How many boys are there?
11. 11.690 − ? = 478
12. 12.? + 173 = 697
13. 13.278 + 615 =
14. 14.A school has 350 children. 119 of them are girls. How many boys are there?
15. 15.541 + 115 =
16. 16.847 − 119 =
17. 17.A train has 571 people in the front coaches and 329 people in the back coaches. How many people are on the train?
18. 18.? + 701 = 848
19. 19.? + 220 = 572
20. 20.A train has 576 people in the front coaches and 265 people in the back coaches. How many people are on the train?
21. 21.632 − 264 =
22. 22.419 + 216 =
23. 23.839 + ? = 982
24. 24.435 − 196 =
25. 25.579 + ? = 877
26. 26.A train has 848 people in the front coaches and 148 people in the back coaches. How many people are on the train?
27. 27.A train has 729 people in the front coaches and 147 people in the back coaches. How many people are on the train?
28. 28.484 − 221 =
29. 29.225 − ? = 110
30. 30.750 − ? = 584
31. 31.235 − 147 =
32. 32.813 − ? = 34
33. 33.252 − 133 =
34. 34.A school has 834 children. 495 of them are girls. How many boys are there?
35. 35.A school has 594 children. 246 of them are girls. How many boys are there?
36. 36.501 + ? = 705
37. 37.719 + 238 =
38. 38.460 − ? = 96
39. 39.? + 252 = 403
40. 40.686 − 132 =

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