Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 459 · 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. 1.879 − 518 =
2. 2.933 − 537 =
3. 3.806 + 125 =
4. 4.509 − 181 =
5. 5.373 − ? = 158
6. 6.939 − 308 =
7. 7.899 − ? = 701
8. 8.A train has 422 people in the front coaches and 155 people in the back coaches. How many people are on the train?
9. 9.? + 100 = 635
10. 10.A school has 650 children. 304 of them are girls. How many boys are there?
11. 11.774 − 362 =
12. 12.816 + 160 =
13. 13.341 − 174 =
14. 14.887 − ? = 155
15. 15.A school has 781 children. 278 of them are girls. How many boys are there?
16. 16.223 + 287 =
17. 17.324 + 368 =
18. 18.414 + 178 =
19. 19.489 − ? = 17
20. 20.130 + 502 =
21. 21.A train has 889 people in the front coaches and 108 people in the back coaches. How many people are on the train?
22. 22.200 − 121 =
23. 23.899 − ? = 22
24. 24.799 − 374 =
25. 25.? + 141 = 494
26. 26.853 + ? = 998
27. 27.775 − ? = 328
28. 28.? + 836 = 985
29. 29.644 − 417 =
30. 30.? + 600 = 772
31. 31.? − 436 = 95
32. 32.183 + 383 =
33. 33.710 + 202 =
34. 34.A school has 204 children. 192 of them are girls. How many boys are there?
35. 35.301 + 276 =
36. 36.A school has 714 children. 166 of them are girls. How many boys are there?
37. 37.196 + 194 =
38. 38.? + 842 = 973
39. 39.330 − ? = 166
40. 40.621 − 267 =

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