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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 690 · 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.? + 772 = 916
  2. 2.975 − 441 =
  3. 3.991 − ? = 719
  4. 4.A school has 734 children. 274 of them are girls. How many boys are there?
  5. 5.A school has 962 children. 321 of them are girls. How many boys are there?
  6. 6.873 + 119 =
  7. 7.? − 273 = 27
  8. 8.918 − 652 =
  9. 9.A school has 362 children. 244 of them are girls. How many boys are there?
  10. 10.942 − 224 =
  11. 11.220 + 174 =
  12. 12.A school has 711 children. 133 of them are girls. How many boys are there?
  13. 13.193 + 284 =
  14. 14.A school has 914 children. 685 of them are girls. How many boys are there?
  15. 15.A school has 663 children. 602 of them are girls. How many boys are there?
  16. 16.681 + 217 =
  17. 17.? + 287 = 725
  18. 18.836 − ? = 606
  19. 19.890 + 106 =
  20. 20.A train has 805 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  21. 21.A train has 767 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  22. 22.A train has 872 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  23. 23.514 + 134 =
  24. 24.A school has 368 children. 115 of them are girls. How many boys are there?
  25. 25.A school has 255 children. 228 of them are girls. How many boys are there?
  26. 26.181 + 754 =
  27. 27.A school has 790 children. 493 of them are girls. How many boys are there?
  28. 28.500 − ? = 252
  29. 29.A train has 826 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  30. 30.646 − 128 =
  31. 31.813 + 152 =
  32. 32.A school has 938 children. 302 of them are girls. How many boys are there?
  33. 33.300 − 149 =
  34. 34.236 + 299 =
  35. 35.117 + ? = 289
  36. 36.? + 395 = 884
  37. 37.886 − 435 =
  38. 38.272 − 174 =
  39. 39.889 − 840 =
  40. 40.747 − 167 =

Answer key

  1. 144
  2. 534
  3. 272
  4. 460
  5. 641
  6. 992
  7. 300
  8. 266
  9. 118
  10. 718
  11. 394
  12. 578
  13. 477
  14. 229
  15. 61
  16. 898
  17. 438
  18. 230
  19. 996
  20. 919
  21. 876
  22. 975
  23. 648
  24. 253
  25. 27
  26. 935
  27. 297
  28. 248
  29. 956
  30. 518
  31. 965
  32. 636
  33. 151
  34. 535
  35. 172
  36. 489
  37. 451
  38. 98
  39. 49
  40. 580

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