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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 140 · 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. 1.282 − ? = 174
  2. 2.345 + 646 =
  3. 3.415 + ? = 613
  4. 4.A train has 332 people in the front coaches and 234 people in the back coaches. How many people are on the train?
  5. 5.615 + 230 =
  6. 6.373 − ? = 249
  7. 7.100 + ? = 292
  8. 8.A school has 345 children. 157 of them are girls. How many boys are there?
  9. 9.866 + 116 =
  10. 10.A school has 343 children. 162 of them are girls. How many boys are there?
  11. 11.A train has 116 people in the front coaches and 674 people in the back coaches. How many people are on the train?
  12. 12.474 − 114 =
  13. 13.? − 173 = 281
  14. 14.381 + 477 =
  15. 15.A train has 280 people in the front coaches and 461 people in the back coaches. How many people are on the train?
  16. 16.854 + ? = 991
  17. 17.413 − 185 =
  18. 18.274 + 516 =
  19. 19.? − 518 = 388
  20. 20.? − 260 = 342
  21. 21.624 + ? = 775
  22. 22.720 − ? = 419
  23. 23.A train has 621 people in the front coaches and 164 people in the back coaches. How many people are on the train?
  24. 24.262 + ? = 630
  25. 25.373 + ? = 594
  26. 26.948 − 740 =
  27. 27.A train has 855 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  28. 28.A school has 493 children. 213 of them are girls. How many boys are there?
  29. 29.776 − ? = 70
  30. 30.736 + ? = 838
  31. 31.A school has 607 children. 469 of them are girls. How many boys are there?
  32. 32.? + 471 = 932
  33. 33.A train has 868 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  34. 34.472 − 368 =
  35. 35.786 − ? = 321
  36. 36.A school has 864 children. 193 of them are girls. How many boys are there?
  37. 37.A school has 637 children. 588 of them are girls. How many boys are there?
  38. 38.611 + ? = 858
  39. 39.389 − 303 =
  40. 40.361 − 154 =

Answer key

  1. 108
  2. 991
  3. 198
  4. 566
  5. 845
  6. 124
  7. 192
  8. 188
  9. 982
  10. 181
  11. 790
  12. 360
  13. 454
  14. 858
  15. 741
  16. 137
  17. 228
  18. 790
  19. 906
  20. 602
  21. 151
  22. 301
  23. 785
  24. 368
  25. 221
  26. 208
  27. 976
  28. 280
  29. 706
  30. 102
  31. 138
  32. 461
  33. 988
  34. 104
  35. 465
  36. 671
  37. 49
  38. 247
  39. 86
  40. 207

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