Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 797 · 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. 1.533 + 269 =
2. 2.A train has 227 people in the front coaches and 646 people in the back coaches. How many people are on the train?
3. 3.A school has 527 children. 112 of them are girls. How many boys are there?
4. 4.472 + 163 =
5. 5.? + 703 = 852
6. 6.A school has 364 children. 121 of them are girls. How many boys are there?
7. 7.736 − 339 =
8. 8.523 + 369 =
9. 9.764 − 575 =
10. 10.585 − ? = 240
11. 11.? − 241 = 61
12. 12.423 − 174 =
13. 13.A school has 728 children. 273 of them are girls. How many boys are there?
14. 14.A school has 361 children. 160 of them are girls. How many boys are there?
15. 15.561 − 299 =
16. 16.? + 357 = 497
17. 17.337 − 321 =
18. 18.A train has 250 people in the front coaches and 346 people in the back coaches. How many people are on the train?
19. 19.869 − 388 =
20. 20.677 − ? = 159
21. 21.563 + 430 =
22. 22.744 + 223 =
23. 23.759 − 712 =
24. 24.A train has 531 people in the front coaches and 107 people in the back coaches. How many people are on the train?
25. 25.? + 497 = 727
26. 26.? − 440 = 144
27. 27.481 − 251 =
28. 28.462 + 411 =
29. 29.888 − 170 =
30. 30.348 + ? = 637
31. 31.677 − 583 =
32. 32.736 + 187 =
33. 33.643 + 153 =
34. 34.A train has 881 people in the front coaches and 104 people in the back coaches. How many people are on the train?
35. 35.801 + 180 =
36. 36.303 − 151 =
37. 37.A train has 419 people in the front coaches and 480 people in the back coaches. How many people are on the train?
38. 38.281 + 404 =
39. 39.862 + 108 =
40. 40.584 + 284 =

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