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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 430 · 40 sums
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.? + 500 = 637
  2. 2.399 + 561 =
  3. 3.561 + ? = 836
  4. 4.711 + 110 =
  5. 5.453 − 291 =
  6. 6.A school has 778 children. 720 of them are girls. How many boys are there?
  7. 7.461 − ? = 115
  8. 8.388 − ? = 24
  9. 9.773 + 207 =
  10. 10.365 + 619 =
  11. 11.401 + 453 =
  12. 12.575 − 429 =
  13. 13.418 − 318 =
  14. 14.? + 416 = 618
  15. 15.A school has 789 children. 328 of them are girls. How many boys are there?
  16. 16.A school has 825 children. 560 of them are girls. How many boys are there?
  17. 17.A train has 110 people in the front coaches and 394 people in the back coaches. How many people are on the train?
  18. 18.805 + 143 =
  19. 19.? − 109 = 529
  20. 20.434 − 225 =
  21. 21.480 + 212 =
  22. 22.769 − 756 =
  23. 23.? − 610 = 6
  24. 24.? + 717 = 940
  25. 25.? − 163 = 375
  26. 26.A train has 503 people in the front coaches and 495 people in the back coaches. How many people are on the train?
  27. 27.A school has 254 children. 244 of them are girls. How many boys are there?
  28. 28.346 + 610 =
  29. 29.525 + ? = 951
  30. 30.A train has 873 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  31. 31.822 − 262 =
  32. 32.A train has 183 people in the front coaches and 286 people in the back coaches. How many people are on the train?
  33. 33.497 + 198 =
  34. 34.980 − 346 =
  35. 35.A train has 363 people in the front coaches and 594 people in the back coaches. How many people are on the train?
  36. 36.470 − 245 =
  37. 37.308 − 223 =
  38. 38.A train has 665 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  39. 39.588 + 319 =
  40. 40.A school has 596 children. 286 of them are girls. How many boys are there?

Answer key

  1. 137
  2. 960
  3. 275
  4. 821
  5. 162
  6. 58
  7. 346
  8. 364
  9. 980
  10. 984
  11. 854
  12. 146
  13. 100
  14. 202
  15. 461
  16. 265
  17. 504
  18. 948
  19. 638
  20. 209
  21. 692
  22. 13
  23. 616
  24. 223
  25. 538
  26. 998
  27. 10
  28. 956
  29. 426
  30. 982
  31. 560
  32. 469
  33. 695
  34. 634
  35. 957
  36. 225
  37. 85
  38. 808
  39. 907
  40. 310

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