Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 165 · 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. 1.764 − ? = 625
2. 2.310 − ? = 118
3. 3.870 + 112 =
4. 4.A train has 865 people in the front coaches and 110 people in the back coaches. How many people are on the train?
5. 5.692 + 120 =
6. 6.A school has 981 children. 259 of them are girls. How many boys are there?
7. 7.783 − 455 =
8. 8.745 + 144 =
9. 9.? + 159 = 327
10. 10.A train has 541 people in the front coaches and 114 people in the back coaches. How many people are on the train?
11. 11.250 + 124 =
12. 12.A school has 430 children. 239 of them are girls. How many boys are there?
13. 13.259 − 118 =
14. 14.A train has 839 people in the front coaches and 113 people in the back coaches. How many people are on the train?
15. 15.374 − 197 =
16. 16.665 − ? = 112
17. 17.A train has 197 people in the front coaches and 694 people in the back coaches. How many people are on the train?
18. 18.344 − 315 =
19. 19.A train has 127 people in the front coaches and 675 people in the back coaches. How many people are on the train?
20. 20.A school has 859 children. 351 of them are girls. How many boys are there?
21. 21.A train has 262 people in the front coaches and 555 people in the back coaches. How many people are on the train?
22. 22.565 + 411 =
23. 23.A train has 490 people in the front coaches and 508 people in the back coaches. How many people are on the train?
24. 24.595 + 403 =
25. 25.273 − ? = 166
26. 26.140 + 228 =
27. 27.A school has 630 children. 296 of them are girls. How many boys are there?
28. 28.A train has 399 people in the front coaches and 232 people in the back coaches. How many people are on the train?
29. 29.324 + ? = 587
30. 30.240 + 196 =
31. 31.A school has 286 children. 105 of them are girls. How many boys are there?
32. 32.638 − 238 =
33. 33.? − 243 = 126
34. 34.A train has 852 people in the front coaches and 108 people in the back coaches. How many people are on the train?
35. 35.A school has 886 children. 543 of them are girls. How many boys are there?
36. 36.? + 193 = 933
37. 37.435 − 145 =
38. 38.A school has 775 children. 719 of them are girls. How many boys are there?
39. 39.A train has 749 people in the front coaches and 130 people in the back coaches. How many people are on the train?
40. 40.377 − 146 =

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