Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 139 · 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.A school has 643 children. 345 of them are girls. How many boys are there?
2. 2.465 + 372 =
3. 3.286 − 182 =
4. 4.A school has 368 children. 107 of them are girls. How many boys are there?
5. 5.264 − ? = 86
6. 6.A school has 782 children. 262 of them are girls. How many boys are there?
7. 7.A train has 324 people in the front coaches and 530 people in the back coaches. How many people are on the train?
8. 8.366 + 514 =
9. 9.134 + 309 =
10. 10.A school has 218 children. 208 of them are girls. How many boys are there?
11. 11.A school has 555 children. 516 of them are girls. How many boys are there?
12. 12.654 − 332 =
13. 13.308 + ? = 672
14. 14.184 + ? = 810
15. 15.403 − 282 =
16. 16.448 + ? = 890
17. 17.653 + ? = 769
18. 18.431 − 239 =
19. 19.? − 290 = 371
20. 20.810 + 125 =
21. 21.219 − 210 =
22. 22.A train has 358 people in the front coaches and 310 people in the back coaches. How many people are on the train?
23. 23.926 − 208 =
24. 24.906 − 586 =
25. 25.512 − 443 =
26. 26.570 − 128 =
27. 27.? − 749 = 192
28. 28.? + 356 = 465
29. 29.306 − 155 =
30. 30.? − 400 = 320
31. 31.A train has 533 people in the front coaches and 246 people in the back coaches. How many people are on the train?
32. 32.? + 846 = 990
33. 33.504 + 160 =
34. 34.297 − 202 =
35. 35.A school has 789 children. 427 of them are girls. How many boys are there?
36. 36.216 + 623 =
37. 37.412 − ? = 34
38. 38.345 + 330 =
39. 39.A school has 644 children. 530 of them are girls. How many boys are there?
40. 40.467 − ? = 295

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