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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 269 · 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. 1.672 + 241 =
  2. 2.496 − ? = 276
  3. 3.A school has 590 children. 470 of them are girls. How many boys are there?
  4. 4.241 − 149 =
  5. 5.A school has 911 children. 769 of them are girls. How many boys are there?
  6. 6.762 + 141 =
  7. 7.386 − 176 =
  8. 8.A school has 386 children. 365 of them are girls. How many boys are there?
  9. 9.A school has 252 children. 170 of them are girls. How many boys are there?
  10. 10.A school has 536 children. 462 of them are girls. How many boys are there?
  11. 11.767 − 749 =
  12. 12.A train has 242 people in the front coaches and 714 people in the back coaches. How many people are on the train?
  13. 13.? + 117 = 321
  14. 14.705 − 672 =
  15. 15.? + 821 = 975
  16. 16.A school has 386 children. 296 of them are girls. How many boys are there?
  17. 17.167 + 137 =
  18. 18.152 + ? = 931
  19. 19.576 − ? = 9
  20. 20.452 + 391 =
  21. 21.? − 136 = 75
  22. 22.737 + ? = 958
  23. 23.A train has 290 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  24. 24.423 + 553 =
  25. 25.? + 149 = 795
  26. 26.A train has 828 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  27. 27.564 − 491 =
  28. 28.880 + 103 =
  29. 29.690 − ? = 575
  30. 30.A school has 388 children. 371 of them are girls. How many boys are there?
  31. 31.367 + 487 =
  32. 32.382 − 284 =
  33. 33.891 − 197 =
  34. 34.147 + 578 =
  35. 35.660 + 210 =
  36. 36.265 − 140 =
  37. 37.377 + 314 =
  38. 38.A school has 803 children. 317 of them are girls. How many boys are there?
  39. 39.261 + ? = 944
  40. 40.136 + 129 =

Answer key

  1. 913
  2. 220
  3. 120
  4. 92
  5. 142
  6. 903
  7. 210
  8. 21
  9. 82
  10. 74
  11. 18
  12. 956
  13. 204
  14. 33
  15. 154
  16. 90
  17. 304
  18. 779
  19. 567
  20. 843
  21. 211
  22. 221
  23. 446
  24. 976
  25. 646
  26. 940
  27. 73
  28. 983
  29. 115
  30. 17
  31. 854
  32. 98
  33. 694
  34. 725
  35. 870
  36. 125
  37. 691
  38. 486
  39. 683
  40. 265

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