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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 791 · 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.A school has 430 children. 320 of them are girls. How many boys are there?
  2. 2.A train has 394 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  3. 3.120 + 422 =
  4. 4.A train has 749 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  5. 5.388 − 167 =
  6. 6.214 + 179 =
  7. 7.779 − 310 =
  8. 8.441 + ? = 915
  9. 9.? + 125 = 404
  10. 10.? − 356 = 21
  11. 11.? + 787 = 936
  12. 12.A school has 790 children. 465 of them are girls. How many boys are there?
  13. 13.467 − ? = 143
  14. 14.? − 230 = 141
  15. 15.A train has 682 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  16. 16.? − 635 = 85
  17. 17.365 + 221 =
  18. 18.623 + 282 =
  19. 19.379 − 327 =
  20. 20.A school has 977 children. 621 of them are girls. How many boys are there?
  21. 21.526 + 317 =
  22. 22.? − 678 = 289
  23. 23.A school has 539 children. 449 of them are girls. How many boys are there?
  24. 24.? − 693 = 225
  25. 25.A train has 757 people in the front coaches and 155 people in the back coaches. How many people are on the train?
  26. 26.602 + 124 =
  27. 27.? − 530 = 448
  28. 28.201 − 108 =
  29. 29.257 − 235 =
  30. 30.687 − 209 =
  31. 31.A school has 488 children. 253 of them are girls. How many boys are there?
  32. 32.314 − 260 =
  33. 33.A train has 646 people in the front coaches and 163 people in the back coaches. How many people are on the train?
  34. 34.877 + 105 =
  35. 35.805 + 163 =
  36. 36.A train has 318 people in the front coaches and 165 people in the back coaches. How many people are on the train?
  37. 37.A train has 771 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  38. 38.A train has 634 people in the front coaches and 283 people in the back coaches. How many people are on the train?
  39. 39.? + 231 = 947
  40. 40.605 + ? = 996

Answer key

  1. 110
  2. 494
  3. 542
  4. 944
  5. 221
  6. 393
  7. 469
  8. 474
  9. 279
  10. 377
  11. 149
  12. 325
  13. 324
  14. 371
  15. 789
  16. 720
  17. 586
  18. 905
  19. 52
  20. 356
  21. 843
  22. 967
  23. 90
  24. 918
  25. 912
  26. 726
  27. 978
  28. 93
  29. 22
  30. 478
  31. 235
  32. 54
  33. 809
  34. 982
  35. 968
  36. 483
  37. 970
  38. 917
  39. 716
  40. 391

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