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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 805 · 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. 1.257 + 446 =
  2. 2.694 + 271 =
  3. 3.449 + 393 =
  4. 4.269 + ? = 671
  5. 5.A school has 702 children. 104 of them are girls. How many boys are there?
  6. 6.422 − ? = 295
  7. 7.651 + 300 =
  8. 8.A school has 366 children. 350 of them are girls. How many boys are there?
  9. 9.A school has 224 children. 100 of them are girls. How many boys are there?
  10. 10.? + 529 = 635
  11. 11.146 + ? = 341
  12. 12.319 + ? = 734
  13. 13.845 − ? = 696
  14. 14.244 − 197 =
  15. 15.234 − 226 =
  16. 16.A school has 275 children. 164 of them are girls. How many boys are there?
  17. 17.A school has 700 children. 251 of them are girls. How many boys are there?
  18. 18.? + 757 = 962
  19. 19.810 + 127 =
  20. 20.221 − ? = 72
  21. 21.A school has 486 children. 284 of them are girls. How many boys are there?
  22. 22.787 + ? = 927
  23. 23.A train has 702 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  24. 24.A school has 587 children. 239 of them are girls. How many boys are there?
  25. 25.660 + 236 =
  26. 26.A school has 941 children. 500 of them are girls. How many boys are there?
  27. 27.645 − 188 =
  28. 28.A school has 765 children. 405 of them are girls. How many boys are there?
  29. 29.? − 167 = 228
  30. 30.A train has 514 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  31. 31.A school has 818 children. 556 of them are girls. How many boys are there?
  32. 32.A school has 471 children. 357 of them are girls. How many boys are there?
  33. 33.501 − 292 =
  34. 34.561 − 156 =
  35. 35.173 + 814 =
  36. 36.250 − ? = 100
  37. 37.A school has 916 children. 464 of them are girls. How many boys are there?
  38. 38.537 + 185 =
  39. 39.? + 389 = 644
  40. 40.? − 448 = 171

Answer key

  1. 703
  2. 965
  3. 842
  4. 402
  5. 598
  6. 127
  7. 951
  8. 16
  9. 124
  10. 106
  11. 195
  12. 415
  13. 149
  14. 47
  15. 8
  16. 111
  17. 449
  18. 205
  19. 937
  20. 149
  21. 202
  22. 140
  23. 883
  24. 348
  25. 896
  26. 441
  27. 457
  28. 360
  29. 395
  30. 661
  31. 262
  32. 114
  33. 209
  34. 405
  35. 987
  36. 150
  37. 452
  38. 722
  39. 255
  40. 619

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