Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 415 · 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. 1.301 + ? = 832
2. 2.899 − 862 =
3. 3.? − 309 = 42
4. 4.611 − ? = 141
5. 5.655 − 582 =
6. 6.197 + ? = 694
7. 7.751 − ? = 614
8. 8.257 + ? = 892
9. 9.281 − 118 =
10. 10.804 + 170 =
11. 11.? − 335 = 139
12. 12.A train has 590 people in the front coaches and 191 people in the back coaches. How many people are on the train?
13. 13.662 + 219 =
14. 14.? − 219 = 171
15. 15.217 + 261 =
16. 16.579 + 243 =
17. 17.? − 451 = 36
18. 18.A train has 400 people in the front coaches and 169 people in the back coaches. How many people are on the train?
19. 19.865 − ? = 753
20. 20.A train has 142 people in the front coaches and 313 people in the back coaches. How many people are on the train?
21. 21.613 − 256 =
22. 22.A school has 392 children. 379 of them are girls. How many boys are there?
23. 23.549 − 228 =
24. 24.466 + 187 =
25. 25.253 − 112 =
26. 26.A train has 109 people in the front coaches and 852 people in the back coaches. How many people are on the train?
27. 27.484 − ? = 146
28. 28.773 + 192 =
29. 29.? + 148 = 739
30. 30.A train has 485 people in the front coaches and 281 people in the back coaches. How many people are on the train?
31. 31.A train has 503 people in the front coaches and 339 people in the back coaches. How many people are on the train?
32. 32.? − 297 = 125
33. 33.A train has 660 people in the front coaches and 205 people in the back coaches. How many people are on the train?
34. 34.? + 167 = 871
35. 35.766 − 436 =
36. 36.528 + ? = 705
37. 37.575 − 267 =
38. 38.754 + ? = 952
39. 39.128 + ? = 424
40. 40.421 − ? = 91

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