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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 612 · 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.? − 188 = 227
  2. 2.765 + 167 =
  3. 3.113 + 871 =
  4. 4.830 − ? = 76
  5. 5.257 + 514 =
  6. 6.? − 342 = 135
  7. 7.A train has 360 people in the front coaches and 461 people in the back coaches. How many people are on the train?
  8. 8.? − 120 = 627
  9. 9.751 + ? = 906
  10. 10.309 − 177 =
  11. 11.A school has 249 children. 166 of them are girls. How many boys are there?
  12. 12.A school has 539 children. 249 of them are girls. How many boys are there?
  13. 13.475 + 145 =
  14. 14.354 + 536 =
  15. 15.? − 252 = 84
  16. 16.284 − 278 =
  17. 17.451 + 518 =
  18. 18.? − 415 = 532
  19. 19.A train has 383 people in the front coaches and 319 people in the back coaches. How many people are on the train?
  20. 20.429 + 497 =
  21. 21.388 + 475 =
  22. 22.435 + ? = 851
  23. 23.233 − 216 =
  24. 24.826 + ? = 939
  25. 25.384 + ? = 698
  26. 26.A school has 402 children. 131 of them are girls. How many boys are there?
  27. 27.A school has 965 children. 132 of them are girls. How many boys are there?
  28. 28.686 + ? = 837
  29. 29.529 − 343 =
  30. 30.911 − 743 =
  31. 31.867 − 383 =
  32. 32.? + 754 = 937
  33. 33.282 + 172 =
  34. 34.A train has 687 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  35. 35.639 + ? = 772
  36. 36.? + 365 = 654
  37. 37.558 − 321 =
  38. 38.A train has 509 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  39. 39.? − 173 = 192
  40. 40.? + 637 = 871

Answer key

  1. 415
  2. 932
  3. 984
  4. 754
  5. 771
  6. 477
  7. 821
  8. 747
  9. 155
  10. 132
  11. 83
  12. 290
  13. 620
  14. 890
  15. 336
  16. 6
  17. 969
  18. 947
  19. 702
  20. 926
  21. 863
  22. 416
  23. 17
  24. 113
  25. 314
  26. 271
  27. 833
  28. 151
  29. 186
  30. 168
  31. 484
  32. 183
  33. 454
  34. 827
  35. 133
  36. 289
  37. 237
  38. 676
  39. 365
  40. 234

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