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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 881 · 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. 1.205 + ? = 583
  2. 2.557 + 441 =
  3. 3.? − 110 = 107
  4. 4.148 + 806 =
  5. 5.504 − 369 =
  6. 6.202 − 139 =
  7. 7.A school has 885 children. 289 of them are girls. How many boys are there?
  8. 8.467 − 184 =
  9. 9.? + 370 = 647
  10. 10.A school has 444 children. 199 of them are girls. How many boys are there?
  11. 11.A train has 481 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  12. 12.331 − 151 =
  13. 13.201 − 175 =
  14. 14.816 − ? = 219
  15. 15.356 + ? = 872
  16. 16.495 + 255 =
  17. 17.571 − 150 =
  18. 18.A school has 227 children. 140 of them are girls. How many boys are there?
  19. 19.261 + ? = 603
  20. 20.595 + ? = 883
  21. 21.A train has 216 people in the front coaches and 753 people in the back coaches. How many people are on the train?
  22. 22.537 + ? = 670
  23. 23.? + 865 = 992
  24. 24.822 + 150 =
  25. 25.A school has 456 children. 142 of them are girls. How many boys are there?
  26. 26.A school has 697 children. 570 of them are girls. How many boys are there?
  27. 27.A train has 772 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  28. 28.989 − 188 =
  29. 29.286 − 256 =
  30. 30.A school has 275 children. 184 of them are girls. How many boys are there?
  31. 31.A school has 559 children. 105 of them are girls. How many boys are there?
  32. 32.432 + 184 =
  33. 33.? + 232 = 836
  34. 34.268 − 155 =
  35. 35.? + 709 = 846
  36. 36.? − 362 = 6
  37. 37.? − 182 = 214
  38. 38.? − 109 = 93
  39. 39.A school has 958 children. 646 of them are girls. How many boys are there?
  40. 40.520 + ? = 667

Answer key

  1. 378
  2. 998
  3. 217
  4. 954
  5. 135
  6. 63
  7. 596
  8. 283
  9. 277
  10. 245
  11. 766
  12. 180
  13. 26
  14. 597
  15. 516
  16. 750
  17. 421
  18. 87
  19. 342
  20. 288
  21. 969
  22. 133
  23. 127
  24. 972
  25. 314
  26. 127
  27. 903
  28. 801
  29. 30
  30. 91
  31. 454
  32. 616
  33. 604
  34. 113
  35. 137
  36. 368
  37. 396
  38. 202
  39. 312
  40. 147

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