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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 987 · 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. 1.432 + 248 =
  2. 2.? + 759 = 927
  3. 3.A train has 543 people in the front coaches and 151 people in the back coaches. How many people are on the train?
  4. 4.152 + ? = 295
  5. 5.553 − ? = 385
  6. 6.A school has 347 children. 339 of them are girls. How many boys are there?
  7. 7.880 + 103 =
  8. 8.? + 197 = 828
  9. 9.830 − 334 =
  10. 10.A train has 622 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  11. 11.860 + ? = 962
  12. 12.A school has 606 children. 263 of them are girls. How many boys are there?
  13. 13.? + 308 = 749
  14. 14.A train has 479 people in the front coaches and 334 people in the back coaches. How many people are on the train?
  15. 15.A school has 695 children. 236 of them are girls. How many boys are there?
  16. 16.255 − 124 =
  17. 17.956 − ? = 30
  18. 18.A school has 623 children. 177 of them are girls. How many boys are there?
  19. 19.A train has 696 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  20. 20.277 + 129 =
  21. 21.? − 209 = 49
  22. 22.A school has 491 children. 469 of them are girls. How many boys are there?
  23. 23.A school has 340 children. 231 of them are girls. How many boys are there?
  24. 24.497 + 371 =
  25. 25.562 + ? = 753
  26. 26.308 + 350 =
  27. 27.A school has 917 children. 674 of them are girls. How many boys are there?
  28. 28.A school has 636 children. 187 of them are girls. How many boys are there?
  29. 29.239 + ? = 346
  30. 30.A school has 279 children. 149 of them are girls. How many boys are there?
  31. 31.100 + 750 =
  32. 32.A train has 893 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  33. 33.A school has 920 children. 107 of them are girls. How many boys are there?
  34. 34.995 − 845 =
  35. 35.? + 824 = 961
  36. 36.? − 139 = 68
  37. 37.610 − 418 =
  38. 38.458 + ? = 754
  39. 39.534 + ? = 843
  40. 40.? − 365 = 479

Answer key

  1. 680
  2. 168
  3. 694
  4. 143
  5. 168
  6. 8
  7. 983
  8. 631
  9. 496
  10. 739
  11. 102
  12. 343
  13. 441
  14. 813
  15. 459
  16. 131
  17. 926
  18. 446
  19. 846
  20. 406
  21. 258
  22. 22
  23. 109
  24. 868
  25. 191
  26. 658
  27. 243
  28. 449
  29. 107
  30. 130
  31. 850
  32. 994
  33. 813
  34. 150
  35. 137
  36. 207
  37. 192
  38. 296
  39. 309
  40. 844

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