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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 265 · 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.? + 381 = 880
  2. 2.A train has 116 people in the front coaches and 826 people in the back coaches. How many people are on the train?
  3. 3.561 − 324 =
  4. 4.? − 430 = 477
  5. 5.862 + 137 =
  6. 6.451 − ? = 20
  7. 7.417 + ? = 518
  8. 8.A school has 370 children. 137 of them are girls. How many boys are there?
  9. 9.741 + 137 =
  10. 10.881 − 867 =
  11. 11.621 − 526 =
  12. 12.332 − 262 =
  13. 13.522 + 448 =
  14. 14.A school has 648 children. 264 of them are girls. How many boys are there?
  15. 15.? + 854 = 986
  16. 16.A school has 929 children. 189 of them are girls. How many boys are there?
  17. 17.303 − 288 =
  18. 18.? + 128 = 424
  19. 19.594 − ? = 468
  20. 20.A train has 683 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  21. 21.472 − ? = 89
  22. 22.877 − 123 =
  23. 23.? − 263 = 57
  24. 24.921 − 183 =
  25. 25.A school has 856 children. 599 of them are girls. How many boys are there?
  26. 26.984 − 126 =
  27. 27.A train has 116 people in the front coaches and 246 people in the back coaches. How many people are on the train?
  28. 28.A train has 469 people in the front coaches and 318 people in the back coaches. How many people are on the train?
  29. 29.870 + 110 =
  30. 30.A train has 783 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  31. 31.565 + ? = 904
  32. 32.A train has 241 people in the front coaches and 511 people in the back coaches. How many people are on the train?
  33. 33.310 − ? = 173
  34. 34.435 + 167 =
  35. 35.A train has 579 people in the front coaches and 269 people in the back coaches. How many people are on the train?
  36. 36.? − 651 = 77
  37. 37.? + 634 = 762
  38. 38.637 − 159 =
  39. 39.407 − 375 =
  40. 40.207 + ? = 857

Answer key

  1. 499
  2. 942
  3. 237
  4. 907
  5. 999
  6. 431
  7. 101
  8. 233
  9. 878
  10. 14
  11. 95
  12. 70
  13. 970
  14. 384
  15. 132
  16. 740
  17. 15
  18. 296
  19. 126
  20. 899
  21. 383
  22. 754
  23. 320
  24. 738
  25. 257
  26. 858
  27. 362
  28. 787
  29. 980
  30. 913
  31. 339
  32. 752
  33. 137
  34. 602
  35. 848
  36. 728
  37. 128
  38. 478
  39. 32
  40. 650

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