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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 257 · 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.? + 784 = 987
  2. 2.727 − ? = 456
  3. 3.186 + 506 =
  4. 4.A train has 388 people in the front coaches and 344 people in the back coaches. How many people are on the train?
  5. 5.? − 245 = 524
  6. 6.270 − 118 =
  7. 7.224 + 246 =
  8. 8.436 + 483 =
  9. 9.? − 145 = 565
  10. 10.799 − ? = 561
  11. 11.167 + ? = 631
  12. 12.? − 575 = 99
  13. 13.? + 293 = 472
  14. 14.A school has 960 children. 816 of them are girls. How many boys are there?
  15. 15.? − 316 = 219
  16. 16.424 − ? = 263
  17. 17.A train has 776 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  18. 18.876 + ? = 982
  19. 19.? + 128 = 528
  20. 20.A school has 295 children. 214 of them are girls. How many boys are there?
  21. 21.268 − 203 =
  22. 22.564 + ? = 725
  23. 23.419 − ? = 281
  24. 24.A train has 291 people in the front coaches and 569 people in the back coaches. How many people are on the train?
  25. 25.A school has 472 children. 409 of them are girls. How many boys are there?
  26. 26.285 − 173 =
  27. 27.? + 172 = 356
  28. 28.874 − 735 =
  29. 29.A school has 995 children. 738 of them are girls. How many boys are there?
  30. 30.A school has 682 children. 603 of them are girls. How many boys are there?
  31. 31.262 + 169 =
  32. 32.539 + 453 =
  33. 33.A train has 450 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  34. 34.A school has 646 children. 133 of them are girls. How many boys are there?
  35. 35.312 − 170 =
  36. 36.270 − 260 =
  37. 37.A train has 114 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  38. 38.? − 159 = 70
  39. 39.605 + ? = 888
  40. 40.635 + 208 =

Answer key

  1. 203
  2. 271
  3. 692
  4. 732
  5. 769
  6. 152
  7. 470
  8. 919
  9. 710
  10. 238
  11. 464
  12. 674
  13. 179
  14. 144
  15. 535
  16. 161
  17. 900
  18. 106
  19. 400
  20. 81
  21. 65
  22. 161
  23. 138
  24. 860
  25. 63
  26. 112
  27. 184
  28. 139
  29. 257
  30. 79
  31. 431
  32. 992
  33. 823
  34. 513
  35. 142
  36. 10
  37. 384
  38. 229
  39. 283
  40. 843

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