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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 671 · 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. 1.724 − ? = 180
  2. 2.320 − 126 =
  3. 3.512 + 301 =
  4. 4.? + 700 = 870
  5. 5.A school has 731 children. 285 of them are girls. How many boys are there?
  6. 6.? + 454 = 560
  7. 7.? + 561 = 817
  8. 8.385 + ? = 962
  9. 9.456 − 106 =
  10. 10.A train has 782 people in the front coaches and 217 people in the back coaches. How many people are on the train?
  11. 11.275 + 124 =
  12. 12.962 − 329 =
  13. 13.917 − 145 =
  14. 14.540 + ? = 824
  15. 15.A train has 884 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  16. 16.A school has 355 children. 223 of them are girls. How many boys are there?
  17. 17.A train has 563 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  18. 18.? + 188 = 386
  19. 19.? + 733 = 919
  20. 20.A train has 356 people in the front coaches and 316 people in the back coaches. How many people are on the train?
  21. 21.790 + 113 =
  22. 22.592 + 225 =
  23. 23.461 − ? = 302
  24. 24.176 + ? = 628
  25. 25.? − 128 = 100
  26. 26.799 + 146 =
  27. 27.? − 169 = 412
  28. 28.498 − 373 =
  29. 29.? − 107 = 204
  30. 30.? + 333 = 780
  31. 31.A train has 177 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  32. 32.624 + 279 =
  33. 33.672 − 571 =
  34. 34.956 − 147 =
  35. 35.? − 394 = 556
  36. 36.A school has 212 children. 127 of them are girls. How many boys are there?
  37. 37.A train has 349 people in the front coaches and 586 people in the back coaches. How many people are on the train?
  38. 38.800 + 192 =
  39. 39.764 + 168 =
  40. 40.? + 145 = 825

Answer key

  1. 544
  2. 194
  3. 813
  4. 170
  5. 446
  6. 106
  7. 256
  8. 577
  9. 350
  10. 999
  11. 399
  12. 633
  13. 772
  14. 284
  15. 993
  16. 132
  17. 683
  18. 198
  19. 186
  20. 672
  21. 903
  22. 817
  23. 159
  24. 452
  25. 228
  26. 945
  27. 581
  28. 125
  29. 311
  30. 447
  31. 354
  32. 903
  33. 101
  34. 809
  35. 950
  36. 85
  37. 935
  38. 992
  39. 932
  40. 680

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