Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 440 · 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 train has 500 people in the front coaches and 156 people in the back coaches. How many people are on the train?
2. 2.336 − 171 =
3. 3.421 − 116 =
4. 4.A train has 742 people in the front coaches and 217 people in the back coaches. How many people are on the train?
5. 5.? + 397 = 751
6. 6.510 + 381 =
7. 7.114 + 701 =
8. 8.392 − 116 =
9. 9.A train has 445 people in the front coaches and 219 people in the back coaches. How many people are on the train?
10. 10.? + 281 = 963
11. 11.728 − 483 =
12. 12.833 − 528 =
13. 13.A train has 365 people in the front coaches and 277 people in the back coaches. How many people are on the train?
14. 14.654 − 489 =
15. 15.831 + 133 =
16. 16.A school has 840 children. 125 of them are girls. How many boys are there?
17. 17.407 + ? = 739
18. 18.829 − ? = 538
19. 19.A train has 319 people in the front coaches and 264 people in the back coaches. How many people are on the train?
20. 20.A train has 527 people in the front coaches and 356 people in the back coaches. How many people are on the train?
21. 21.? + 726 = 927
22. 22.A train has 109 people in the front coaches and 878 people in the back coaches. How many people are on the train?
23. 23.? − 564 = 375
24. 24.A train has 263 people in the front coaches and 667 people in the back coaches. How many people are on the train?
25. 25.364 + 396 =
26. 26.A school has 899 children. 726 of them are girls. How many boys are there?
27. 27.438 − 119 =
28. 28.A school has 231 children. 207 of them are girls. How many boys are there?
29. 29.707 − ? = 477
30. 30.A train has 139 people in the front coaches and 722 people in the back coaches. How many people are on the train?
31. 31.258 + 610 =
32. 32.969 − ? = 188
33. 33.628 + 108 =
34. 34.289 + ? = 538
35. 35.A school has 821 children. 771 of them are girls. How many boys are there?
36. 36.A train has 354 people in the front coaches and 618 people in the back coaches. How many people are on the train?
37. 37.656 + ? = 777
38. 38.A train has 792 people in the front coaches and 174 people in the back coaches. How many people are on the train?
39. 39.? − 236 = 17
40. 40.A train has 338 people in the front coaches and 281 people in the back coaches. How many people are on the train?

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