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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 710 · 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. 1.438 − 126 =
  2. 2.662 + 146 =
  3. 3.166 + 244 =
  4. 4.? − 246 = 420
  5. 5.427 − 223 =
  6. 6.? + 526 = 981
  7. 7.? + 365 = 982
  8. 8.649 + ? = 911
  9. 9.812 − 706 =
  10. 10.641 − 258 =
  11. 11.950 − ? = 798
  12. 12.763 − 277 =
  13. 13.? − 298 = 72
  14. 14.816 + ? = 982
  15. 15.A train has 206 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  16. 16.? + 728 = 841
  17. 17.697 − 529 =
  18. 18.210 − ? = 88
  19. 19.A train has 815 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  20. 20.393 + 171 =
  21. 21.333 + 317 =
  22. 22.585 − ? = 467
  23. 23.347 − 195 =
  24. 24.165 + ? = 351
  25. 25.A train has 824 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  26. 26.A school has 987 children. 590 of them are girls. How many boys are there?
  27. 27.219 − 101 =
  28. 28.777 − 220 =
  29. 29.459 − 254 =
  30. 30.? + 670 = 831
  31. 31.A train has 665 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  32. 32.? + 320 = 698
  33. 33.? − 510 = 160
  34. 34.A school has 561 children. 321 of them are girls. How many boys are there?
  35. 35.A train has 782 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  36. 36.829 − ? = 566
  37. 37.A train has 234 people in the front coaches and 438 people in the back coaches. How many people are on the train?
  38. 38.? + 627 = 796
  39. 39.A school has 472 children. 462 of them are girls. How many boys are there?
  40. 40.397 + 500 =

Answer key

  1. 312
  2. 808
  3. 410
  4. 666
  5. 204
  6. 455
  7. 617
  8. 262
  9. 106
  10. 383
  11. 152
  12. 486
  13. 370
  14. 166
  15. 461
  16. 113
  17. 168
  18. 122
  19. 926
  20. 564
  21. 650
  22. 118
  23. 152
  24. 186
  25. 968
  26. 397
  27. 118
  28. 557
  29. 205
  30. 161
  31. 778
  32. 378
  33. 670
  34. 240
  35. 887
  36. 263
  37. 672
  38. 169
  39. 10
  40. 897

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