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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 595 · 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.A school has 298 children. 245 of them are girls. How many boys are there?
  2. 2.A school has 421 children. 215 of them are girls. How many boys are there?
  3. 3.252 − 143 =
  4. 4.? − 282 = 428
  5. 5.A train has 517 people in the front coaches and 278 people in the back coaches. How many people are on the train?
  6. 6.849 + 150 =
  7. 7.608 − 567 =
  8. 8.A school has 945 children. 831 of them are girls. How many boys are there?
  9. 9.A train has 198 people in the front coaches and 554 people in the back coaches. How many people are on the train?
  10. 10.248 + 460 =
  11. 11.263 − ? = 94
  12. 12.317 + 523 =
  13. 13.607 − ? = 145
  14. 14.? + 348 = 978
  15. 15.482 − 398 =
  16. 16.419 − 303 =
  17. 17.A train has 529 people in the front coaches and 469 people in the back coaches. How many people are on the train?
  18. 18.666 + 172 =
  19. 19.? + 322 = 443
  20. 20.213 − 184 =
  21. 21.315 − ? = 109
  22. 22.? + 354 = 861
  23. 23.A train has 491 people in the front coaches and 226 people in the back coaches. How many people are on the train?
  24. 24.330 + ? = 782
  25. 25.120 + 174 =
  26. 26.? + 449 = 658
  27. 27.A train has 658 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  28. 28.974 − 442 =
  29. 29.292 + 442 =
  30. 30.A train has 590 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  31. 31.261 + 243 =
  32. 32.A school has 266 children. 264 of them are girls. How many boys are there?
  33. 33.103 + ? = 596
  34. 34.295 − 133 =
  35. 35.? + 799 = 983
  36. 36.466 − 196 =
  37. 37.A school has 415 children. 397 of them are girls. How many boys are there?
  38. 38.? − 285 = 652
  39. 39.251 − 208 =
  40. 40.465 + 122 =

Answer key

  1. 53
  2. 206
  3. 109
  4. 710
  5. 795
  6. 999
  7. 41
  8. 114
  9. 752
  10. 708
  11. 169
  12. 840
  13. 462
  14. 630
  15. 84
  16. 116
  17. 998
  18. 838
  19. 121
  20. 29
  21. 206
  22. 507
  23. 717
  24. 452
  25. 294
  26. 209
  27. 781
  28. 532
  29. 734
  30. 778
  31. 504
  32. 2
  33. 493
  34. 162
  35. 184
  36. 270
  37. 18
  38. 937
  39. 43
  40. 587

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