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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 826 · 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. 1.334 − 214 =
  2. 2.A train has 327 people in the front coaches and 604 people in the back coaches. How many people are on the train?
  3. 3.434 − 305 =
  4. 4.A school has 328 children. 287 of them are girls. How many boys are there?
  5. 5.820 + ? = 971
  6. 6.831 − 675 =
  7. 7.825 + ? = 999
  8. 8.A school has 474 children. 318 of them are girls. How many boys are there?
  9. 9.? + 299 = 838
  10. 10.? − 180 = 101
  11. 11.A train has 517 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  12. 12.651 − 613 =
  13. 13.? − 297 = 44
  14. 14.A train has 732 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  15. 15.A school has 381 children. 219 of them are girls. How many boys are there?
  16. 16.A school has 673 children. 305 of them are girls. How many boys are there?
  17. 17.A train has 675 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  18. 18.A train has 463 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  19. 19.485 + 310 =
  20. 20.A school has 663 children. 143 of them are girls. How many boys are there?
  21. 21.666 − 570 =
  22. 22.324 − 188 =
  23. 23.571 + 171 =
  24. 24.169 + 500 =
  25. 25.219 − ? = 27
  26. 26.878 − 486 =
  27. 27.? − 512 = 464
  28. 28.832 + 143 =
  29. 29.A school has 285 children. 204 of them are girls. How many boys are there?
  30. 30.426 − 422 =
  31. 31.718 − 481 =
  32. 32.A train has 271 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  33. 33.A school has 678 children. 197 of them are girls. How many boys are there?
  34. 34.688 + 254 =
  35. 35.496 + 132 =
  36. 36.A train has 303 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  37. 37.501 + 494 =
  38. 38.982 − 186 =
  39. 39.505 − ? = 400
  40. 40.210 + ? = 851

Answer key

  1. 120
  2. 931
  3. 129
  4. 41
  5. 151
  6. 156
  7. 174
  8. 156
  9. 539
  10. 281
  11. 684
  12. 38
  13. 341
  14. 851
  15. 162
  16. 368
  17. 804
  18. 625
  19. 795
  20. 520
  21. 96
  22. 136
  23. 742
  24. 669
  25. 192
  26. 392
  27. 976
  28. 975
  29. 81
  30. 4
  31. 237
  32. 533
  33. 481
  34. 942
  35. 628
  36. 411
  37. 995
  38. 796
  39. 105
  40. 641

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