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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 241 · 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.A school has 343 children. 123 of them are girls. How many boys are there?
  2. 2.649 + 127 =
  3. 3.347 + 652 =
  4. 4.A school has 673 children. 360 of them are girls. How many boys are there?
  5. 5.456 + 429 =
  6. 6.178 + 356 =
  7. 7.349 − 134 =
  8. 8.424 + 107 =
  9. 9.A train has 394 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  10. 10.445 − ? = 224
  11. 11.A train has 505 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  12. 12.A school has 276 children. 129 of them are girls. How many boys are there?
  13. 13.A train has 293 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  14. 14.? − 149 = 390
  15. 15.542 − ? = 430
  16. 16.? − 108 = 148
  17. 17.A train has 823 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  18. 18.A school has 750 children. 476 of them are girls. How many boys are there?
  19. 19.? − 103 = 202
  20. 20.? − 626 = 204
  21. 21.A train has 606 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  22. 22.? + 793 = 907
  23. 23.? + 525 = 739
  24. 24.A train has 647 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  25. 25.351 + ? = 479
  26. 26.688 + ? = 819
  27. 27.647 − ? = 430
  28. 28.830 + 169 =
  29. 29.983 − ? = 304
  30. 30.? − 854 = 77
  31. 31.? − 135 = 416
  32. 32.A train has 824 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  33. 33.A train has 405 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  34. 34.765 − ? = 400
  35. 35.813 + 123 =
  36. 36.778 − 418 =
  37. 37.A train has 737 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  38. 38.? − 170 = 30
  39. 39.458 − ? = 286
  40. 40.A school has 405 children. 117 of them are girls. How many boys are there?

Answer key

  1. 220
  2. 776
  3. 999
  4. 313
  5. 885
  6. 534
  7. 215
  8. 531
  9. 533
  10. 221
  11. 673
  12. 147
  13. 413
  14. 539
  15. 112
  16. 256
  17. 931
  18. 274
  19. 305
  20. 830
  21. 796
  22. 114
  23. 214
  24. 932
  25. 128
  26. 131
  27. 217
  28. 999
  29. 679
  30. 931
  31. 551
  32. 978
  33. 507
  34. 365
  35. 936
  36. 360
  37. 879
  38. 200
  39. 172
  40. 288

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