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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 532 · 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.? + 275 = 486
  2. 2.A school has 912 children. 677 of them are girls. How many boys are there?
  3. 3.643 + ? = 775
  4. 4.577 + ? = 815
  5. 5.A school has 599 children. 523 of them are girls. How many boys are there?
  6. 6.A school has 919 children. 542 of them are girls. How many boys are there?
  7. 7.589 + 258 =
  8. 8.872 + 105 =
  9. 9.A train has 711 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  10. 10.? + 793 = 937
  11. 11.A school has 289 children. 150 of them are girls. How many boys are there?
  12. 12.389 + 158 =
  13. 13.A school has 285 children. 253 of them are girls. How many boys are there?
  14. 14.? − 140 = 172
  15. 15.A school has 216 children. 129 of them are girls. How many boys are there?
  16. 16.225 − ? = 57
  17. 17.221 − 185 =
  18. 18.276 − 142 =
  19. 19.585 + 329 =
  20. 20.414 − ? = 131
  21. 21.275 + 324 =
  22. 22.? − 497 = 434
  23. 23.327 + ? = 751
  24. 24.545 + 431 =
  25. 25.? − 117 = 223
  26. 26.? − 193 = 123
  27. 27.289 + 126 =
  28. 28.351 + 454 =
  29. 29.A train has 582 people in the front coaches and 250 people in the back coaches. How many people are on the train?
  30. 30.? − 152 = 129
  31. 31.495 + 264 =
  32. 32.A school has 514 children. 120 of them are girls. How many boys are there?
  33. 33.A school has 706 children. 614 of them are girls. How many boys are there?
  34. 34.934 − 533 =
  35. 35.A school has 458 children. 200 of them are girls. How many boys are there?
  36. 36.722 − ? = 34
  37. 37.A school has 416 children. 116 of them are girls. How many boys are there?
  38. 38.? + 378 = 927
  39. 39.A train has 200 people in the front coaches and 666 people in the back coaches. How many people are on the train?
  40. 40.A train has 735 people in the front coaches and 223 people in the back coaches. How many people are on the train?

Answer key

  1. 211
  2. 235
  3. 132
  4. 238
  5. 76
  6. 377
  7. 847
  8. 977
  9. 853
  10. 144
  11. 139
  12. 547
  13. 32
  14. 312
  15. 87
  16. 168
  17. 36
  18. 134
  19. 914
  20. 283
  21. 599
  22. 931
  23. 424
  24. 976
  25. 340
  26. 316
  27. 415
  28. 805
  29. 832
  30. 281
  31. 759
  32. 394
  33. 92
  34. 401
  35. 258
  36. 688
  37. 300
  38. 549
  39. 866
  40. 958

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