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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 75 · 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. 1.715 + ? = 972
  2. 2.A train has 134 people in the front coaches and 782 people in the back coaches. How many people are on the train?
  3. 3.425 − 296 =
  4. 4.? − 531 = 27
  5. 5.261 − 104 =
  6. 6.? + 605 = 968
  7. 7.718 − ? = 512
  8. 8.A train has 294 people in the front coaches and 406 people in the back coaches. How many people are on the train?
  9. 9.691 − 186 =
  10. 10.A train has 526 people in the front coaches and 426 people in the back coaches. How many people are on the train?
  11. 11.854 − 491 =
  12. 12.? + 574 = 824
  13. 13.740 + ? = 841
  14. 14.A train has 538 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  15. 15.355 − 116 =
  16. 16.A school has 489 children. 188 of them are girls. How many boys are there?
  17. 17.A train has 425 people in the front coaches and 462 people in the back coaches. How many people are on the train?
  18. 18.283 + 563 =
  19. 19.246 − 140 =
  20. 20.869 − ? = 281
  21. 21.? + 594 = 722
  22. 22.? + 688 = 863
  23. 23.147 + 432 =
  24. 24.? − 576 = 284
  25. 25.708 − ? = 4
  26. 26.A train has 894 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  27. 27.A train has 652 people in the front coaches and 224 people in the back coaches. How many people are on the train?
  28. 28.A school has 691 children. 224 of them are girls. How many boys are there?
  29. 29.337 − 121 =
  30. 30.A school has 634 children. 542 of them are girls. How many boys are there?
  31. 31.A school has 352 children. 129 of them are girls. How many boys are there?
  32. 32.590 − ? = 465
  33. 33.861 − 787 =
  34. 34.452 − ? = 320
  35. 35.A school has 986 children. 467 of them are girls. How many boys are there?
  36. 36.? − 209 = 70
  37. 37.674 + 199 =
  38. 38.A train has 571 people in the front coaches and 289 people in the back coaches. How many people are on the train?
  39. 39.578 + 288 =
  40. 40.A school has 581 children. 117 of them are girls. How many boys are there?

Answer key

  1. 257
  2. 916
  3. 129
  4. 558
  5. 157
  6. 363
  7. 206
  8. 700
  9. 505
  10. 952
  11. 363
  12. 250
  13. 101
  14. 674
  15. 239
  16. 301
  17. 887
  18. 846
  19. 106
  20. 588
  21. 128
  22. 175
  23. 579
  24. 860
  25. 704
  26. 997
  27. 876
  28. 467
  29. 216
  30. 92
  31. 223
  32. 125
  33. 74
  34. 132
  35. 519
  36. 279
  37. 873
  38. 860
  39. 866
  40. 464

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