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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 820 · 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. 1.845 + 144 =
  2. 2.A train has 420 people in the front coaches and 246 people in the back coaches. How many people are on the train?
  3. 3.434 + ? = 570
  4. 4.? + 149 = 749
  5. 5.? + 365 = 696
  6. 6.402 − ? = 127
  7. 7.237 + 567 =
  8. 8.791 + 200 =
  9. 9.? − 260 = 108
  10. 10.178 + 339 =
  11. 11.? − 218 = 4
  12. 12.943 − ? = 770
  13. 13.572 + 277 =
  14. 14.A train has 267 people in the front coaches and 716 people in the back coaches. How many people are on the train?
  15. 15.212 + 743 =
  16. 16.A school has 333 children. 147 of them are girls. How many boys are there?
  17. 17.232 + 375 =
  18. 18.? + 758 = 891
  19. 19.669 − ? = 36
  20. 20.441 − 380 =
  21. 21.A school has 506 children. 360 of them are girls. How many boys are there?
  22. 22.? − 317 = 103
  23. 23.? + 105 = 584
  24. 24.? − 406 = 422
  25. 25.A train has 246 people in the front coaches and 457 people in the back coaches. How many people are on the train?
  26. 26.920 − 214 =
  27. 27.425 − 150 =
  28. 28.? + 830 = 950
  29. 29.998 − ? = 578
  30. 30.166 + 733 =
  31. 31.145 + ? = 738
  32. 32.237 − 108 =
  33. 33.A train has 420 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  34. 34.A train has 743 people in the front coaches and 226 people in the back coaches. How many people are on the train?
  35. 35.399 + ? = 928
  36. 36.728 + ? = 987
  37. 37.A school has 304 children. 286 of them are girls. How many boys are there?
  38. 38.A train has 241 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  39. 39.? − 338 = 122
  40. 40.? + 577 = 829

Answer key

  1. 989
  2. 666
  3. 136
  4. 600
  5. 331
  6. 275
  7. 804
  8. 991
  9. 368
  10. 517
  11. 222
  12. 173
  13. 849
  14. 983
  15. 955
  16. 186
  17. 607
  18. 133
  19. 633
  20. 61
  21. 146
  22. 420
  23. 479
  24. 828
  25. 703
  26. 706
  27. 275
  28. 120
  29. 420
  30. 899
  31. 593
  32. 129
  33. 557
  34. 969
  35. 529
  36. 259
  37. 18
  38. 365
  39. 460
  40. 252

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