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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 264 · 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.? + 663 = 904
  2. 2.A train has 520 people in the front coaches and 470 people in the back coaches. How many people are on the train?
  3. 3.345 + 285 =
  4. 4.793 − 750 =
  5. 5.743 − 281 =
  6. 6.? − 464 = 366
  7. 7.A school has 329 children. 259 of them are girls. How many boys are there?
  8. 8.A train has 364 people in the front coaches and 244 people in the back coaches. How many people are on the train?
  9. 9.589 − ? = 125
  10. 10.373 − 118 =
  11. 11.509 + 402 =
  12. 12.335 + 349 =
  13. 13.A school has 990 children. 378 of them are girls. How many boys are there?
  14. 14.493 − 219 =
  15. 15.A train has 851 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  16. 16.? − 298 = 147
  17. 17.498 + ? = 706
  18. 18.A school has 354 children. 271 of them are girls. How many boys are there?
  19. 19.221 − ? = 111
  20. 20.259 + 243 =
  21. 21.751 − 137 =
  22. 22.224 + 686 =
  23. 23.907 − 401 =
  24. 24.325 − ? = 213
  25. 25.? + 894 = 995
  26. 26.182 + ? = 848
  27. 27.798 − 160 =
  28. 28.150 + 767 =
  29. 29.816 + 156 =
  30. 30.? − 154 = 273
  31. 31.497 + ? = 835
  32. 32.764 − 470 =
  33. 33.379 − 354 =
  34. 34.162 + 182 =
  35. 35.A train has 760 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  36. 36.852 + 113 =
  37. 37.? + 885 = 988
  38. 38.A train has 511 people in the front coaches and 287 people in the back coaches. How many people are on the train?
  39. 39.? − 360 = 162
  40. 40.A train has 153 people in the front coaches and 559 people in the back coaches. How many people are on the train?

Answer key

  1. 241
  2. 990
  3. 630
  4. 43
  5. 462
  6. 830
  7. 70
  8. 608
  9. 464
  10. 255
  11. 911
  12. 684
  13. 612
  14. 274
  15. 958
  16. 445
  17. 208
  18. 83
  19. 110
  20. 502
  21. 614
  22. 910
  23. 506
  24. 112
  25. 101
  26. 666
  27. 638
  28. 917
  29. 972
  30. 427
  31. 338
  32. 294
  33. 25
  34. 344
  35. 921
  36. 965
  37. 103
  38. 798
  39. 522
  40. 712

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