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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 51 · 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 = 23
  2. 2.A school has 362 children. 164 of them are girls. How many boys are there?
  3. 3.486 + 145 =
  4. 4.896 − 186 =
  5. 5.785 − 347 =
  6. 6.? + 413 = 624
  7. 7.A train has 172 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  8. 8.816 − 362 =
  9. 9.439 − ? = 238
  10. 10.270 + 168 =
  11. 11.605 − ? = 230
  12. 12.A train has 502 people in the front coaches and 473 people in the back coaches. How many people are on the train?
  13. 13.A train has 206 people in the front coaches and 157 people in the back coaches. How many people are on the train?
  14. 14.A school has 943 children. 787 of them are girls. How many boys are there?
  15. 15.737 − 238 =
  16. 16.774 − ? = 222
  17. 17.412 − ? = 141
  18. 18.A train has 575 people in the front coaches and 325 people in the back coaches. How many people are on the train?
  19. 19.526 − 312 =
  20. 20.795 − 122 =
  21. 21.629 − 195 =
  22. 22.A school has 531 children. 140 of them are girls. How many boys are there?
  23. 23.A train has 546 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  24. 24.A train has 780 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  25. 25.831 − ? = 158
  26. 26.? − 187 = 158
  27. 27.880 + 101 =
  28. 28.758 − 204 =
  29. 29.870 + 108 =
  30. 30.A train has 899 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  31. 31.? − 191 = 676
  32. 32.826 + 149 =
  33. 33.899 + 100 =
  34. 34.? + 634 = 824
  35. 35.555 − 336 =
  36. 36.264 + ? = 800
  37. 37.767 − 335 =
  38. 38.? − 772 = 118
  39. 39.803 + ? = 995
  40. 40.127 + 314 =

Answer key

  1. 357
  2. 198
  3. 631
  4. 710
  5. 438
  6. 211
  7. 356
  8. 454
  9. 201
  10. 438
  11. 375
  12. 975
  13. 363
  14. 156
  15. 499
  16. 552
  17. 271
  18. 900
  19. 214
  20. 673
  21. 434
  22. 391
  23. 718
  24. 934
  25. 673
  26. 345
  27. 981
  28. 554
  29. 978
  30. 999
  31. 867
  32. 975
  33. 999
  34. 190
  35. 219
  36. 536
  37. 432
  38. 890
  39. 192
  40. 441

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