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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 77 · 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. 1.718 + ? = 831
  2. 2.? + 631 = 843
  3. 3.630 + 236 =
  4. 4.A train has 610 people in the front coaches and 242 people in the back coaches. How many people are on the train?
  5. 5.A school has 804 children. 472 of them are girls. How many boys are there?
  6. 6.742 + 138 =
  7. 7.A school has 981 children. 777 of them are girls. How many boys are there?
  8. 8.243 − 169 =
  9. 9.A train has 206 people in the front coaches and 499 people in the back coaches. How many people are on the train?
  10. 10.503 − 124 =
  11. 11.432 − 273 =
  12. 12.612 − 444 =
  13. 13.A train has 304 people in the front coaches and 570 people in the back coaches. How many people are on the train?
  14. 14.? − 183 = 20
  15. 15.? + 468 = 798
  16. 16.A train has 484 people in the front coaches and 250 people in the back coaches. How many people are on the train?
  17. 17.A train has 351 people in the front coaches and 463 people in the back coaches. How many people are on the train?
  18. 18.254 − 215 =
  19. 19.266 + 654 =
  20. 20.751 + 101 =
  21. 21.689 − 666 =
  22. 22.261 + ? = 426
  23. 23.223 − 192 =
  24. 24.? − 343 = 231
  25. 25.? + 851 = 992
  26. 26.619 + ? = 926
  27. 27.267 + ? = 614
  28. 28.288 + 195 =
  29. 29.A school has 974 children. 538 of them are girls. How many boys are there?
  30. 30.906 − 543 =
  31. 31.594 − ? = 24
  32. 32.679 + ? = 964
  33. 33.A school has 413 children. 402 of them are girls. How many boys are there?
  34. 34.A train has 148 people in the front coaches and 737 people in the back coaches. How many people are on the train?
  35. 35.? + 405 = 577
  36. 36.? + 250 = 818
  37. 37.441 + 339 =
  38. 38.A school has 317 children. 301 of them are girls. How many boys are there?
  39. 39.A train has 786 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  40. 40.A train has 884 people in the front coaches and 107 people in the back coaches. How many people are on the train?

Answer key

  1. 113
  2. 212
  3. 866
  4. 852
  5. 332
  6. 880
  7. 204
  8. 74
  9. 705
  10. 379
  11. 159
  12. 168
  13. 874
  14. 203
  15. 330
  16. 734
  17. 814
  18. 39
  19. 920
  20. 852
  21. 23
  22. 165
  23. 31
  24. 574
  25. 141
  26. 307
  27. 347
  28. 483
  29. 436
  30. 363
  31. 570
  32. 285
  33. 11
  34. 885
  35. 172
  36. 568
  37. 780
  38. 16
  39. 908
  40. 991

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