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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 649 · 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. 1.433 + 147 =
  2. 2.804 + 129 =
  3. 3.A train has 403 people in the front coaches and 427 people in the back coaches. How many people are on the train?
  4. 4.A train has 445 people in the front coaches and 463 people in the back coaches. How many people are on the train?
  5. 5.? + 358 = 526
  6. 6.615 + 326 =
  7. 7.A train has 429 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  8. 8.324 − 238 =
  9. 9.163 + ? = 786
  10. 10.309 + 435 =
  11. 11.A school has 434 children. 321 of them are girls. How many boys are there?
  12. 12.797 − ? = 387
  13. 13.A train has 886 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  14. 14.555 − ? = 227
  15. 15.343 − 103 =
  16. 16.538 + ? = 721
  17. 17.A train has 142 people in the front coaches and 756 people in the back coaches. How many people are on the train?
  18. 18.? − 312 = 58
  19. 19.A school has 838 children. 145 of them are girls. How many boys are there?
  20. 20.603 + 243 =
  21. 21.624 + 247 =
  22. 22.558 − 344 =
  23. 23.679 + ? = 780
  24. 24.166 + 469 =
  25. 25.A school has 726 children. 117 of them are girls. How many boys are there?
  26. 26.980 − 661 =
  27. 27.309 + 298 =
  28. 28.292 + 444 =
  29. 29.204 − ? = 23
  30. 30.324 + ? = 506
  31. 31.? + 186 = 663
  32. 32.A school has 920 children. 594 of them are girls. How many boys are there?
  33. 33.867 + 103 =
  34. 34.195 + ? = 501
  35. 35.? + 684 = 914
  36. 36.332 + ? = 444
  37. 37.304 − 132 =
  38. 38.639 + 180 =
  39. 39.A train has 129 people in the front coaches and 547 people in the back coaches. How many people are on the train?
  40. 40.? + 374 = 501

Answer key

  1. 580
  2. 933
  3. 830
  4. 908
  5. 168
  6. 941
  7. 608
  8. 86
  9. 623
  10. 744
  11. 113
  12. 410
  13. 998
  14. 328
  15. 240
  16. 183
  17. 898
  18. 370
  19. 693
  20. 846
  21. 871
  22. 214
  23. 101
  24. 635
  25. 609
  26. 319
  27. 607
  28. 736
  29. 181
  30. 182
  31. 477
  32. 326
  33. 970
  34. 306
  35. 230
  36. 112
  37. 172
  38. 819
  39. 676
  40. 127

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