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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 856 · 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. 1.360 − ? = 226
  2. 2.A school has 997 children. 319 of them are girls. How many boys are there?
  3. 3.410 − ? = 53
  4. 4.A school has 502 children. 281 of them are girls. How many boys are there?
  5. 5.? − 370 = 40
  6. 6.A train has 219 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  7. 7.A train has 139 people in the front coaches and 645 people in the back coaches. How many people are on the train?
  8. 8.376 + 267 =
  9. 9.A train has 844 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  10. 10.A train has 358 people in the front coaches and 236 people in the back coaches. How many people are on the train?
  11. 11.887 + 108 =
  12. 12.227 + 123 =
  13. 13.A train has 228 people in the front coaches and 423 people in the back coaches. How many people are on the train?
  14. 14.709 + 196 =
  15. 15.A train has 300 people in the front coaches and 415 people in the back coaches. How many people are on the train?
  16. 16.235 + 166 =
  17. 17.? − 234 = 23
  18. 18.? − 106 = 342
  19. 19.A train has 361 people in the front coaches and 437 people in the back coaches. How many people are on the train?
  20. 20.891 + 105 =
  21. 21.A school has 408 children. 265 of them are girls. How many boys are there?
  22. 22.A train has 850 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  23. 23.? + 789 = 913
  24. 24.663 + ? = 981
  25. 25.144 + 526 =
  26. 26.A school has 258 children. 216 of them are girls. How many boys are there?
  27. 27.A train has 558 people in the front coaches and 438 people in the back coaches. How many people are on the train?
  28. 28.562 − ? = 428
  29. 29.A school has 230 children. 207 of them are girls. How many boys are there?
  30. 30.721 − 317 =
  31. 31.347 + ? = 556
  32. 32.653 + 335 =
  33. 33.A school has 393 children. 313 of them are girls. How many boys are there?
  34. 34.884 + 114 =
  35. 35.? − 252 = 469
  36. 36.800 − 284 =
  37. 37.542 + 293 =
  38. 38.209 + ? = 627
  39. 39.A school has 388 children. 154 of them are girls. How many boys are there?
  40. 40.? + 823 = 985

Answer key

  1. 134
  2. 678
  3. 357
  4. 221
  5. 410
  6. 343
  7. 784
  8. 643
  9. 985
  10. 594
  11. 995
  12. 350
  13. 651
  14. 905
  15. 715
  16. 401
  17. 257
  18. 448
  19. 798
  20. 996
  21. 143
  22. 967
  23. 124
  24. 318
  25. 670
  26. 42
  27. 996
  28. 134
  29. 23
  30. 404
  31. 209
  32. 988
  33. 80
  34. 998
  35. 721
  36. 516
  37. 835
  38. 418
  39. 234
  40. 162

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