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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 815 · 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. 1.276 + ? = 710
  2. 2.? + 821 = 952
  3. 3.457 − 311 =
  4. 4.A school has 458 children. 111 of them are girls. How many boys are there?
  5. 5.657 + ? = 848
  6. 6.737 + 185 =
  7. 7.325 + ? = 439
  8. 8.A school has 520 children. 497 of them are girls. How many boys are there?
  9. 9.A train has 232 people in the front coaches and 657 people in the back coaches. How many people are on the train?
  10. 10.A train has 109 people in the front coaches and 694 people in the back coaches. How many people are on the train?
  11. 11.? + 178 = 353
  12. 12.352 − 297 =
  13. 13.408 − 228 =
  14. 14.A school has 622 children. 172 of them are girls. How many boys are there?
  15. 15.254 − 120 =
  16. 16.648 + 193 =
  17. 17.735 + 146 =
  18. 18.513 − 102 =
  19. 19.807 − ? = 576
  20. 20.891 − ? = 590
  21. 21.A train has 199 people in the front coaches and 442 people in the back coaches. How many people are on the train?
  22. 22.376 + 348 =
  23. 23.567 − ? = 107
  24. 24.591 − ? = 152
  25. 25.A school has 540 children. 158 of them are girls. How many boys are there?
  26. 26.226 − 210 =
  27. 27.A train has 588 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  28. 28.687 + 204 =
  29. 29.481 − ? = 267
  30. 30.A school has 307 children. 239 of them are girls. How many boys are there?
  31. 31.635 − 503 =
  32. 32.A school has 306 children. 212 of them are girls. How many boys are there?
  33. 33.A school has 960 children. 359 of them are girls. How many boys are there?
  34. 34.A train has 432 people in the front coaches and 231 people in the back coaches. How many people are on the train?
  35. 35.827 + ? = 994
  36. 36.228 + ? = 776
  37. 37.A school has 893 children. 414 of them are girls. How many boys are there?
  38. 38.A school has 569 children. 319 of them are girls. How many boys are there?
  39. 39.? + 253 = 472
  40. 40.238 − ? = 88

Answer key

  1. 434
  2. 131
  3. 146
  4. 347
  5. 191
  6. 922
  7. 114
  8. 23
  9. 889
  10. 803
  11. 175
  12. 55
  13. 180
  14. 450
  15. 134
  16. 841
  17. 881
  18. 411
  19. 231
  20. 301
  21. 641
  22. 724
  23. 460
  24. 439
  25. 382
  26. 16
  27. 703
  28. 891
  29. 214
  30. 68
  31. 132
  32. 94
  33. 601
  34. 663
  35. 167
  36. 548
  37. 479
  38. 250
  39. 219
  40. 150

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