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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 650 · 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.? − 143 = 461
  2. 2.834 − ? = 687
  3. 3.A school has 823 children. 737 of them are girls. How many boys are there?
  4. 4.883 − ? = 210
  5. 5.610 + 369 =
  6. 6.A school has 754 children. 474 of them are girls. How many boys are there?
  7. 7.A school has 338 children. 117 of them are girls. How many boys are there?
  8. 8.443 − 318 =
  9. 9.A school has 330 children. 229 of them are girls. How many boys are there?
  10. 10.512 − 440 =
  11. 11.306 + ? = 535
  12. 12.A train has 421 people in the front coaches and 437 people in the back coaches. How many people are on the train?
  13. 13.A train has 581 people in the front coaches and 333 people in the back coaches. How many people are on the train?
  14. 14.507 − 318 =
  15. 15.217 + 131 =
  16. 16.972 − 661 =
  17. 17.A train has 550 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  18. 18.567 − 209 =
  19. 19.693 − 488 =
  20. 20.675 + ? = 909
  21. 21.A train has 542 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  22. 22.230 + 271 =
  23. 23.582 − ? = 80
  24. 24.156 + 121 =
  25. 25.265 − 258 =
  26. 26.A school has 588 children. 124 of them are girls. How many boys are there?
  27. 27.201 + ? = 636
  28. 28.A train has 191 people in the front coaches and 665 people in the back coaches. How many people are on the train?
  29. 29.? − 778 = 217
  30. 30.? − 157 = 820
  31. 31.795 − 105 =
  32. 32.365 − 310 =
  33. 33.821 + 119 =
  34. 34.802 − ? = 241
  35. 35.472 + 443 =
  36. 36.556 − ? = 345
  37. 37.? − 372 = 325
  38. 38.A train has 766 people in the front coaches and 203 people in the back coaches. How many people are on the train?
  39. 39.356 − ? = 22
  40. 40.782 + 174 =

Answer key

  1. 604
  2. 147
  3. 86
  4. 673
  5. 979
  6. 280
  7. 221
  8. 125
  9. 101
  10. 72
  11. 229
  12. 858
  13. 914
  14. 189
  15. 348
  16. 311
  17. 726
  18. 358
  19. 205
  20. 234
  21. 737
  22. 501
  23. 502
  24. 277
  25. 7
  26. 464
  27. 435
  28. 856
  29. 995
  30. 977
  31. 690
  32. 55
  33. 940
  34. 561
  35. 915
  36. 211
  37. 697
  38. 969
  39. 334
  40. 956

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