Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 293 · 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. 1.101 + 585 =
2. 2.A train has 295 people in the front coaches and 247 people in the back coaches. How many people are on the train?
3. 3.A train has 420 people in the front coaches and 444 people in the back coaches. How many people are on the train?
4. 4.? + 761 = 871
5. 5.? + 880 = 993
6. 6.? + 813 = 934
7. 7.102 + 266 =
8. 8.916 − 372 =
9. 9.208 − 149 =
10. 10.A school has 661 children. 359 of them are girls. How many boys are there?
11. 11.120 + 478 =
12. 12.A school has 519 children. 478 of them are girls. How many boys are there?
13. 13.435 + 457 =
14. 14.A school has 562 children. 384 of them are girls. How many boys are there?
15. 15.A school has 660 children. 233 of them are girls. How many boys are there?
16. 16.537 − ? = 19
17. 17.A train has 407 people in the front coaches and 333 people in the back coaches. How many people are on the train?
18. 18.473 + 469 =
19. 19.A train has 415 people in the front coaches and 224 people in the back coaches. How many people are on the train?
20. 20.A train has 403 people in the front coaches and 235 people in the back coaches. How many people are on the train?
21. 21.730 + 140 =
22. 22.? + 740 = 870
23. 23.A school has 305 children. 108 of them are girls. How many boys are there?
24. 24.525 + ? = 924
25. 25.385 − 100 =
26. 26.301 − ? = 83
27. 27.558 + 125 =
28. 28.491 − 185 =
29. 29.216 − 164 =
30. 30.? + 710 = 980
31. 31.A train has 779 people in the front coaches and 172 people in the back coaches. How many people are on the train?
32. 32.608 − 342 =
33. 33.A train has 198 people in the front coaches and 126 people in the back coaches. How many people are on the train?
34. 34.A school has 613 children. 269 of them are girls. How many boys are there?
35. 35.? + 409 = 708
36. 36.A train has 102 people in the front coaches and 466 people in the back coaches. How many people are on the train?
37. 37.938 − 657 =
38. 38.138 + 509 =
39. 39.A train has 862 people in the front coaches and 134 people in the back coaches. How many people are on the train?
40. 40.683 − ? = 100

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