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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 109 · 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 463 children. 255 of them are girls. How many boys are there?
  2. 2.A school has 622 children. 127 of them are girls. How many boys are there?
  3. 3.437 − ? = 32
  4. 4.527 + 160 =
  5. 5.A train has 102 people in the front coaches and 769 people in the back coaches. How many people are on the train?
  6. 6.775 + ? = 914
  7. 7.335 − ? = 178
  8. 8.663 + ? = 911
  9. 9.A school has 385 children. 232 of them are girls. How many boys are there?
  10. 10.A school has 734 children. 415 of them are girls. How many boys are there?
  11. 11.594 + 361 =
  12. 12.634 + 119 =
  13. 13.A train has 170 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  14. 14.337 − 143 =
  15. 15.A train has 302 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  16. 16.302 + ? = 422
  17. 17.A school has 956 children. 525 of them are girls. How many boys are there?
  18. 18.A train has 145 people in the front coaches and 504 people in the back coaches. How many people are on the train?
  19. 19.537 + 145 =
  20. 20.659 + 109 =
  21. 21.A school has 783 children. 267 of them are girls. How many boys are there?
  22. 22.A train has 619 people in the front coaches and 379 people in the back coaches. How many people are on the train?
  23. 23.240 + 713 =
  24. 24.A train has 719 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  25. 25.759 − 295 =
  26. 26.205 + 332 =
  27. 27.267 + 369 =
  28. 28.A school has 422 children. 408 of them are girls. How many boys are there?
  29. 29.A school has 844 children. 716 of them are girls. How many boys are there?
  30. 30.650 + 301 =
  31. 31.119 + 294 =
  32. 32.111 + ? = 276
  33. 33.? + 301 = 504
  34. 34.? − 210 = 301
  35. 35.? + 710 = 858
  36. 36.A train has 626 people in the front coaches and 221 people in the back coaches. How many people are on the train?
  37. 37.255 + ? = 398
  38. 38.309 + 620 =
  39. 39.257 − 165 =
  40. 40.389 + ? = 598

Answer key

  1. 208
  2. 495
  3. 405
  4. 687
  5. 871
  6. 139
  7. 157
  8. 248
  9. 153
  10. 319
  11. 955
  12. 753
  13. 355
  14. 194
  15. 441
  16. 120
  17. 431
  18. 649
  19. 682
  20. 768
  21. 516
  22. 998
  23. 953
  24. 826
  25. 464
  26. 537
  27. 636
  28. 14
  29. 128
  30. 951
  31. 413
  32. 165
  33. 203
  34. 511
  35. 148
  36. 847
  37. 143
  38. 929
  39. 92
  40. 209

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