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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 175 · 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. 1.516 + 229 =
  2. 2.? − 204 = 696
  3. 3.A train has 863 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  4. 4.A train has 567 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  5. 5.923 − ? = 398
  6. 6.? + 712 = 820
  7. 7.? − 290 = 41
  8. 8.386 − 166 =
  9. 9.A train has 490 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  10. 10.A school has 257 children. 119 of them are girls. How many boys are there?
  11. 11.302 − 159 =
  12. 12.? + 236 = 382
  13. 13.A school has 314 children. 139 of them are girls. How many boys are there?
  14. 14.644 − 151 =
  15. 15.200 − ? = 85
  16. 16.? − 260 = 475
  17. 17.450 + ? = 772
  18. 18.283 + ? = 432
  19. 19.A train has 208 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  20. 20.589 + 138 =
  21. 21.781 − 519 =
  22. 22.204 + 508 =
  23. 23.847 − 498 =
  24. 24.A train has 281 people in the front coaches and 504 people in the back coaches. How many people are on the train?
  25. 25.A school has 708 children. 695 of them are girls. How many boys are there?
  26. 26.598 − 240 =
  27. 27.284 + 216 =
  28. 28.A train has 248 people in the front coaches and 434 people in the back coaches. How many people are on the train?
  29. 29.823 − ? = 489
  30. 30.A school has 876 children. 140 of them are girls. How many boys are there?
  31. 31.753 + 229 =
  32. 32.536 + 102 =
  33. 33.415 − 151 =
  34. 34.527 − ? = 50
  35. 35.416 + 271 =
  36. 36.261 − ? = 141
  37. 37.A train has 255 people in the front coaches and 398 people in the back coaches. How many people are on the train?
  38. 38.272 + 399 =
  39. 39.274 − ? = 78
  40. 40.554 + 169 =

Answer key

  1. 745
  2. 900
  3. 969
  4. 757
  5. 525
  6. 108
  7. 331
  8. 220
  9. 652
  10. 138
  11. 143
  12. 146
  13. 175
  14. 493
  15. 115
  16. 735
  17. 322
  18. 149
  19. 493
  20. 727
  21. 262
  22. 712
  23. 349
  24. 785
  25. 13
  26. 358
  27. 500
  28. 682
  29. 334
  30. 736
  31. 982
  32. 638
  33. 264
  34. 477
  35. 687
  36. 120
  37. 653
  38. 671
  39. 196
  40. 723

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