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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 151 · 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. 1.814 − 222 =
  2. 2.? + 323 = 549
  3. 3.A train has 404 people in the front coaches and 541 people in the back coaches. How many people are on the train?
  4. 4.A train has 831 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  5. 5.A train has 489 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  6. 6.A train has 761 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  7. 7.708 + ? = 909
  8. 8.A train has 786 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  9. 9.A school has 351 children. 277 of them are girls. How many boys are there?
  10. 10.286 − 178 =
  11. 11.416 − ? = 228
  12. 12.178 + ? = 553
  13. 13.A school has 419 children. 253 of them are girls. How many boys are there?
  14. 14.? + 175 = 757
  15. 15.A school has 553 children. 370 of them are girls. How many boys are there?
  16. 16.528 + 190 =
  17. 17.A train has 158 people in the front coaches and 761 people in the back coaches. How many people are on the train?
  18. 18.A school has 569 children. 352 of them are girls. How many boys are there?
  19. 19.472 + 111 =
  20. 20.752 + 238 =
  21. 21.A train has 785 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  22. 22.804 + 111 =
  23. 23.257 − ? = 11
  24. 24.? − 151 = 570
  25. 25.A school has 903 children. 249 of them are girls. How many boys are there?
  26. 26.A train has 737 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  27. 27.A train has 222 people in the front coaches and 729 people in the back coaches. How many people are on the train?
  28. 28.A school has 539 children. 525 of them are girls. How many boys are there?
  29. 29.A train has 413 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  30. 30.? − 309 = 6
  31. 31.A school has 353 children. 171 of them are girls. How many boys are there?
  32. 32.A school has 797 children. 397 of them are girls. How many boys are there?
  33. 33.239 − ? = 96
  34. 34.698 + 178 =
  35. 35.323 + 188 =
  36. 36.320 + 218 =
  37. 37.A train has 188 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  38. 38.? − 262 = 76
  39. 39.A train has 842 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  40. 40.477 + ? = 623

Answer key

  1. 592
  2. 226
  3. 945
  4. 981
  5. 636
  6. 922
  7. 201
  8. 944
  9. 74
  10. 108
  11. 188
  12. 375
  13. 166
  14. 582
  15. 183
  16. 718
  17. 919
  18. 217
  19. 583
  20. 990
  21. 944
  22. 915
  23. 246
  24. 721
  25. 654
  26. 881
  27. 951
  28. 14
  29. 546
  30. 315
  31. 182
  32. 400
  33. 143
  34. 876
  35. 511
  36. 538
  37. 478
  38. 338
  39. 977
  40. 146

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