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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 279 · 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 758 children. 242 of them are girls. How many boys are there?
  2. 2.A train has 763 people in the front coaches and 163 people in the back coaches. How many people are on the train?
  3. 3.A train has 117 people in the front coaches and 546 people in the back coaches. How many people are on the train?
  4. 4.A school has 759 children. 755 of them are girls. How many boys are there?
  5. 5.A school has 459 children. 129 of them are girls. How many boys are there?
  6. 6.A school has 610 children. 323 of them are girls. How many boys are there?
  7. 7.? + 642 = 746
  8. 8.246 − ? = 40
  9. 9.330 + ? = 538
  10. 10.? + 854 = 996
  11. 11.365 − 291 =
  12. 12.597 − 302 =
  13. 13.? − 200 = 69
  14. 14.? + 822 = 950
  15. 15.A school has 993 children. 128 of them are girls. How many boys are there?
  16. 16.A school has 887 children. 204 of them are girls. How many boys are there?
  17. 17.A school has 361 children. 348 of them are girls. How many boys are there?
  18. 18.A school has 953 children. 392 of them are girls. How many boys are there?
  19. 19.? − 129 = 374
  20. 20.733 + 199 =
  21. 21.A train has 693 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  22. 22.A school has 678 children. 189 of them are girls. How many boys are there?
  23. 23.? − 732 = 79
  24. 24.? − 104 = 395
  25. 25.A train has 891 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  26. 26.A train has 218 people in the front coaches and 718 people in the back coaches. How many people are on the train?
  27. 27.366 + 512 =
  28. 28.981 − 413 =
  29. 29.789 − ? = 661
  30. 30.? + 371 = 474
  31. 31.A school has 469 children. 363 of them are girls. How many boys are there?
  32. 32.832 − 355 =
  33. 33.780 − ? = 234
  34. 34.A school has 327 children. 251 of them are girls. How many boys are there?
  35. 35.274 − 108 =
  36. 36.709 − 112 =
  37. 37.A school has 270 children. 122 of them are girls. How many boys are there?
  38. 38.? + 498 = 896
  39. 39.468 − 168 =
  40. 40.431 + ? = 594

Answer key

  1. 516
  2. 926
  3. 663
  4. 4
  5. 330
  6. 287
  7. 104
  8. 206
  9. 208
  10. 142
  11. 74
  12. 295
  13. 269
  14. 128
  15. 865
  16. 683
  17. 13
  18. 561
  19. 503
  20. 932
  21. 806
  22. 489
  23. 811
  24. 499
  25. 993
  26. 936
  27. 878
  28. 568
  29. 128
  30. 103
  31. 106
  32. 477
  33. 546
  34. 76
  35. 166
  36. 597
  37. 148
  38. 398
  39. 300
  40. 163

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