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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 375 · 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.? + 211 = 665
  2. 2.A school has 747 children. 701 of them are girls. How many boys are there?
  3. 3.? + 257 = 656
  4. 4.276 − ? = 12
  5. 5.915 − 838 =
  6. 6.? + 283 = 602
  7. 7.663 − 531 =
  8. 8.A school has 277 children. 112 of them are girls. How many boys are there?
  9. 9.238 − ? = 30
  10. 10.466 − ? = 278
  11. 11.458 + ? = 903
  12. 12.A school has 242 children. 154 of them are girls. How many boys are there?
  13. 13.230 − ? = 118
  14. 14.A school has 258 children. 160 of them are girls. How many boys are there?
  15. 15.844 + 114 =
  16. 16.A school has 633 children. 585 of them are girls. How many boys are there?
  17. 17.828 − 383 =
  18. 18.562 − 476 =
  19. 19.582 − 469 =
  20. 20.A school has 826 children. 762 of them are girls. How many boys are there?
  21. 21.298 − 112 =
  22. 22.A train has 100 people in the front coaches and 218 people in the back coaches. How many people are on the train?
  23. 23.254 − ? = 95
  24. 24.854 + 103 =
  25. 25.? + 612 = 863
  26. 26.541 + 325 =
  27. 27.726 + 223 =
  28. 28.278 + 674 =
  29. 29.244 − ? = 32
  30. 30.A train has 421 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  31. 31.? − 207 = 68
  32. 32.A train has 630 people in the front coaches and 261 people in the back coaches. How many people are on the train?
  33. 33.A school has 453 children. 349 of them are girls. How many boys are there?
  34. 34.139 + 497 =
  35. 35.A school has 856 children. 557 of them are girls. How many boys are there?
  36. 36.A school has 435 children. 196 of them are girls. How many boys are there?
  37. 37.A train has 652 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  38. 38.? + 814 = 937
  39. 39.A school has 443 children. 192 of them are girls. How many boys are there?
  40. 40.438 + ? = 797

Answer key

  1. 454
  2. 46
  3. 399
  4. 264
  5. 77
  6. 319
  7. 132
  8. 165
  9. 208
  10. 188
  11. 445
  12. 88
  13. 112
  14. 98
  15. 958
  16. 48
  17. 445
  18. 86
  19. 113
  20. 64
  21. 186
  22. 318
  23. 159
  24. 957
  25. 251
  26. 866
  27. 949
  28. 952
  29. 212
  30. 612
  31. 275
  32. 891
  33. 104
  34. 636
  35. 299
  36. 239
  37. 812
  38. 123
  39. 251
  40. 359

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