Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 167 · 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. 1.332 − 243 =
2. 2.247 + 187 =
3. 3.829 − 124 =
4. 4.? + 194 = 295
5. 5.344 + ? = 820
6. 6.616 + 296 =
7. 7.A school has 319 children. 109 of them are girls. How many boys are there?
8. 8.? − 512 = 201
9. 9.484 − 345 =
10. 10.306 + 193 =
11. 11.A school has 429 children. 249 of them are girls. How many boys are there?
12. 12.965 − 393 =
13. 13.? − 286 = 586
14. 14.? + 483 = 680
15. 15.416 + 232 =
16. 16.A school has 637 children. 197 of them are girls. How many boys are there?
17. 17.? − 107 = 105
18. 18.729 − ? = 90
19. 19.A school has 663 children. 113 of them are girls. How many boys are there?
20. 20.? − 178 = 41
21. 21.605 − 438 =
22. 22.202 + 550 =
23. 23.760 − ? = 531
24. 24.413 − ? = 272
25. 25.209 + 454 =
26. 26.? − 616 = 381
27. 27.419 − 226 =
28. 28.A train has 537 people in the front coaches and 372 people in the back coaches. How many people are on the train?
29. 29.? − 412 = 55
30. 30.A school has 753 children. 362 of them are girls. How many boys are there?
31. 31.893 − ? = 363
32. 32.236 − ? = 92
33. 33.757 + ? = 954
34. 34.129 + ? = 485
35. 35.534 + 121 =
36. 36.? + 872 = 972
37. 37.798 − 784 =
38. 38.A train has 405 people in the front coaches and 308 people in the back coaches. How many people are on the train?
39. 39.298 − 270 =
40. 40.304 − 158 =

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