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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 16 · 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. 1.174 + 630 =
  2. 2.A school has 722 children. 552 of them are girls. How many boys are there?
  3. 3.844 − ? = 158
  4. 4.426 − ? = 162
  5. 5.967 − 217 =
  6. 6.982 − 433 =
  7. 7.580 − 104 =
  8. 8.A school has 649 children. 266 of them are girls. How many boys are there?
  9. 9.A school has 288 children. 179 of them are girls. How many boys are there?
  10. 10.796 − 590 =
  11. 11.346 + 409 =
  12. 12.637 − 264 =
  13. 13.866 − 135 =
  14. 14.? − 482 = 51
  15. 15.432 − ? = 294
  16. 16.A school has 324 children. 132 of them are girls. How many boys are there?
  17. 17.641 − 137 =
  18. 18.471 − 301 =
  19. 19.A school has 492 children. 167 of them are girls. How many boys are there?
  20. 20.802 + 186 =
  21. 21.536 + ? = 916
  22. 22.A train has 161 people in the front coaches and 786 people in the back coaches. How many people are on the train?
  23. 23.649 + 346 =
  24. 24.773 − ? = 545
  25. 25.814 + ? = 943
  26. 26.398 + 281 =
  27. 27.? − 143 = 106
  28. 28.? − 426 = 352
  29. 29.? + 133 = 322
  30. 30.862 − ? = 639
  31. 31.A train has 759 people in the front coaches and 182 people in the back coaches. How many people are on the train?
  32. 32.? + 228 = 902
  33. 33.A train has 261 people in the front coaches and 274 people in the back coaches. How many people are on the train?
  34. 34.381 − 281 =
  35. 35.A school has 736 children. 197 of them are girls. How many boys are there?
  36. 36.276 − ? = 171
  37. 37.481 − 394 =
  38. 38.456 + 279 =
  39. 39.A school has 635 children. 467 of them are girls. How many boys are there?
  40. 40.809 + 175 =

Answer key

  1. 804
  2. 170
  3. 686
  4. 264
  5. 750
  6. 549
  7. 476
  8. 383
  9. 109
  10. 206
  11. 755
  12. 373
  13. 731
  14. 533
  15. 138
  16. 192
  17. 504
  18. 170
  19. 325
  20. 988
  21. 380
  22. 947
  23. 995
  24. 228
  25. 129
  26. 679
  27. 249
  28. 778
  29. 189
  30. 223
  31. 941
  32. 674
  33. 535
  34. 100
  35. 539
  36. 105
  37. 87
  38. 735
  39. 168
  40. 984

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