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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 869 · 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. 1.102 + 784 =
  2. 2.A school has 689 children. 626 of them are girls. How many boys are there?
  3. 3.994 − ? = 580
  4. 4.? + 272 = 442
  5. 5.? + 604 = 730
  6. 6.A train has 157 people in the front coaches and 723 people in the back coaches. How many people are on the train?
  7. 7.A train has 571 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  8. 8.359 + ? = 677
  9. 9.594 + 347 =
  10. 10.A train has 818 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  11. 11.576 − 530 =
  12. 12.A train has 188 people in the front coaches and 504 people in the back coaches. How many people are on the train?
  13. 13.751 − 741 =
  14. 14.833 + ? = 949
  15. 15.577 + ? = 747
  16. 16.? + 192 = 430
  17. 17.634 − 302 =
  18. 18.A school has 309 children. 238 of them are girls. How many boys are there?
  19. 19.A school has 802 children. 159 of them are girls. How many boys are there?
  20. 20.A school has 225 children. 121 of them are girls. How many boys are there?
  21. 21.A school has 237 children. 105 of them are girls. How many boys are there?
  22. 22.843 + 113 =
  23. 23.? − 128 = 168
  24. 24.317 + ? = 802
  25. 25.249 − ? = 77
  26. 26.? + 368 = 513
  27. 27.A train has 350 people in the front coaches and 635 people in the back coaches. How many people are on the train?
  28. 28.A school has 860 children. 753 of them are girls. How many boys are there?
  29. 29.844 + 123 =
  30. 30.508 − 185 =
  31. 31.255 + 593 =
  32. 32.A school has 330 children. 172 of them are girls. How many boys are there?
  33. 33.? − 409 = 71
  34. 34.A school has 308 children. 232 of them are girls. How many boys are there?
  35. 35.? − 260 = 279
  36. 36.338 − ? = 175
  37. 37.A train has 624 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  38. 38.A school has 253 children. 112 of them are girls. How many boys are there?
  39. 39.? + 391 = 639
  40. 40.183 + ? = 334

Answer key

  1. 886
  2. 63
  3. 414
  4. 170
  5. 126
  6. 880
  7. 683
  8. 318
  9. 941
  10. 933
  11. 46
  12. 692
  13. 10
  14. 116
  15. 170
  16. 238
  17. 332
  18. 71
  19. 643
  20. 104
  21. 132
  22. 956
  23. 296
  24. 485
  25. 172
  26. 145
  27. 985
  28. 107
  29. 967
  30. 323
  31. 848
  32. 158
  33. 480
  34. 76
  35. 539
  36. 163
  37. 757
  38. 141
  39. 248
  40. 151

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