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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 985 · 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. 1.769 − 674 =
  2. 2.236 + 300 =
  3. 3.A school has 239 children. 143 of them are girls. How many boys are there?
  4. 4.A school has 410 children. 165 of them are girls. How many boys are there?
  5. 5.A school has 374 children. 178 of them are girls. How many boys are there?
  6. 6.264 − 121 =
  7. 7.631 − 108 =
  8. 8.? + 832 = 939
  9. 9.? + 287 = 555
  10. 10.A train has 614 people in the front coaches and 206 people in the back coaches. How many people are on the train?
  11. 11.? − 125 = 401
  12. 12.A train has 694 people in the front coaches and 288 people in the back coaches. How many people are on the train?
  13. 13.A school has 514 children. 138 of them are girls. How many boys are there?
  14. 14.A train has 772 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  15. 15.A school has 319 children. 272 of them are girls. How many boys are there?
  16. 16.312 − 104 =
  17. 17.222 + ? = 934
  18. 18.? + 166 = 721
  19. 19.A train has 336 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  20. 20.628 − 472 =
  21. 21.815 − 138 =
  22. 22.250 + 629 =
  23. 23.? + 773 = 885
  24. 24.613 − 349 =
  25. 25.421 + ? = 709
  26. 26.A school has 423 children. 421 of them are girls. How many boys are there?
  27. 27.214 − 196 =
  28. 28.A train has 637 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  29. 29.651 − ? = 142
  30. 30.315 − 142 =
  31. 31.722 + 241 =
  32. 32.336 − 238 =
  33. 33.339 − 283 =
  34. 34.920 − 168 =
  35. 35.349 − ? = 40
  36. 36.A school has 930 children. 615 of them are girls. How many boys are there?
  37. 37.396 − ? = 37
  38. 38.195 + 310 =
  39. 39.A school has 887 children. 670 of them are girls. How many boys are there?
  40. 40.A school has 547 children. 525 of them are girls. How many boys are there?

Answer key

  1. 95
  2. 536
  3. 96
  4. 245
  5. 196
  6. 143
  7. 523
  8. 107
  9. 268
  10. 820
  11. 526
  12. 982
  13. 376
  14. 900
  15. 47
  16. 208
  17. 712
  18. 555
  19. 538
  20. 156
  21. 677
  22. 879
  23. 112
  24. 264
  25. 288
  26. 2
  27. 18
  28. 839
  29. 509
  30. 173
  31. 963
  32. 98
  33. 56
  34. 752
  35. 309
  36. 315
  37. 359
  38. 505
  39. 217
  40. 22

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