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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 907 · 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 train has 642 people in the front coaches and 230 people in the back coaches. How many people are on the train?
  2. 2.A school has 309 children. 168 of them are girls. How many boys are there?
  3. 3.A train has 285 people in the front coaches and 462 people in the back coaches. How many people are on the train?
  4. 4.696 + 153 =
  5. 5.A school has 262 children. 181 of them are girls. How many boys are there?
  6. 6.? − 424 = 71
  7. 7.539 + 384 =
  8. 8.A train has 616 people in the front coaches and 281 people in the back coaches. How many people are on the train?
  9. 9.852 − 148 =
  10. 10.895 − ? = 168
  11. 11.252 − 249 =
  12. 12.? + 330 = 531
  13. 13.411 − 180 =
  14. 14.278 − 130 =
  15. 15.127 + ? = 955
  16. 16.667 + 216 =
  17. 17.619 + 358 =
  18. 18.A train has 785 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  19. 19.? + 582 = 743
  20. 20.816 + 123 =
  21. 21.203 + ? = 503
  22. 22.692 − 210 =
  23. 23.801 − 365 =
  24. 24.A school has 904 children. 349 of them are girls. How many boys are there?
  25. 25.515 + 324 =
  26. 26.353 − 343 =
  27. 27.449 − 363 =
  28. 28.A train has 762 people in the front coaches and 208 people in the back coaches. How many people are on the train?
  29. 29.? + 854 = 973
  30. 30.460 + 127 =
  31. 31.269 − 110 =
  32. 32.821 + 158 =
  33. 33.? + 643 = 757
  34. 34.A school has 924 children. 807 of them are girls. How many boys are there?
  35. 35.? − 592 = 138
  36. 36.937 − 806 =
  37. 37.780 + 115 =
  38. 38.757 − 683 =
  39. 39.864 − 215 =
  40. 40.A train has 511 people in the front coaches and 170 people in the back coaches. How many people are on the train?

Answer key

  1. 872
  2. 141
  3. 747
  4. 849
  5. 81
  6. 495
  7. 923
  8. 897
  9. 704
  10. 727
  11. 3
  12. 201
  13. 231
  14. 148
  15. 828
  16. 883
  17. 977
  18. 980
  19. 161
  20. 939
  21. 300
  22. 482
  23. 436
  24. 555
  25. 839
  26. 10
  27. 86
  28. 970
  29. 119
  30. 587
  31. 159
  32. 979
  33. 114
  34. 117
  35. 730
  36. 131
  37. 895
  38. 74
  39. 649
  40. 681

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