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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 993 · 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.? + 100 = 225
  2. 2.878 + 113 =
  3. 3.A school has 403 children. 150 of them are girls. How many boys are there?
  4. 4.A school has 902 children. 735 of them are girls. How many boys are there?
  5. 5.596 − 514 =
  6. 6.375 − 159 =
  7. 7.801 − 798 =
  8. 8.151 + 456 =
  9. 9.A school has 406 children. 334 of them are girls. How many boys are there?
  10. 10.A train has 220 people in the front coaches and 525 people in the back coaches. How many people are on the train?
  11. 11.249 + 187 =
  12. 12.409 − 159 =
  13. 13.420 − 161 =
  14. 14.226 + 307 =
  15. 15.A school has 652 children. 439 of them are girls. How many boys are there?
  16. 16.228 + ? = 952
  17. 17.? − 182 = 100
  18. 18.A school has 547 children. 350 of them are girls. How many boys are there?
  19. 19.236 − 164 =
  20. 20.A school has 203 children. 130 of them are girls. How many boys are there?
  21. 21.206 − ? = 45
  22. 22.A train has 572 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  23. 23.237 + 558 =
  24. 24.? + 819 = 960
  25. 25.? − 169 = 650
  26. 26.452 − 340 =
  27. 27.A school has 944 children. 345 of them are girls. How many boys are there?
  28. 28.A school has 687 children. 479 of them are girls. How many boys are there?
  29. 29.520 + 357 =
  30. 30.A school has 202 children. 158 of them are girls. How many boys are there?
  31. 31.A train has 822 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  32. 32.962 − ? = 95
  33. 33.A school has 503 children. 107 of them are girls. How many boys are there?
  34. 34.359 − 185 =
  35. 35.667 + ? = 836
  36. 36.A school has 626 children. 194 of them are girls. How many boys are there?
  37. 37.361 − ? = 179
  38. 38.894 + ? = 999
  39. 39.174 + 597 =
  40. 40.522 + 122 =

Answer key

  1. 125
  2. 991
  3. 253
  4. 167
  5. 82
  6. 216
  7. 3
  8. 607
  9. 72
  10. 745
  11. 436
  12. 250
  13. 259
  14. 533
  15. 213
  16. 724
  17. 282
  18. 197
  19. 72
  20. 73
  21. 161
  22. 767
  23. 795
  24. 141
  25. 819
  26. 112
  27. 599
  28. 208
  29. 877
  30. 44
  31. 971
  32. 867
  33. 396
  34. 174
  35. 169
  36. 432
  37. 182
  38. 105
  39. 771
  40. 644

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