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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 323 · 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. 1.561 − 182 =
  2. 2.803 + 115 =
  3. 3.226 + 683 =
  4. 4.A train has 216 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  5. 5.A train has 451 people in the front coaches and 505 people in the back coaches. How many people are on the train?
  6. 6.109 + 348 =
  7. 7.A train has 524 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  8. 8.228 − ? = 14
  9. 9.A train has 273 people in the front coaches and 716 people in the back coaches. How many people are on the train?
  10. 10.A train has 106 people in the front coaches and 494 people in the back coaches. How many people are on the train?
  11. 11.670 + ? = 967
  12. 12.374 − 294 =
  13. 13.764 − 380 =
  14. 14.A school has 251 children. 174 of them are girls. How many boys are there?
  15. 15.A train has 864 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  16. 16.? − 155 = 53
  17. 17.774 + 121 =
  18. 18.748 − 735 =
  19. 19.A train has 312 people in the front coaches and 145 people in the back coaches. How many people are on the train?
  20. 20.500 − 408 =
  21. 21.A school has 358 children. 186 of them are girls. How many boys are there?
  22. 22.A train has 873 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  23. 23.391 − 218 =
  24. 24.423 + ? = 838
  25. 25.876 − 839 =
  26. 26.495 + ? = 894
  27. 27.534 + 124 =
  28. 28.695 + 200 =
  29. 29.A school has 956 children. 157 of them are girls. How many boys are there?
  30. 30.A school has 260 children. 160 of them are girls. How many boys are there?
  31. 31.A school has 380 children. 114 of them are girls. How many boys are there?
  32. 32.? − 449 = 4
  33. 33.A school has 610 children. 287 of them are girls. How many boys are there?
  34. 34.160 + 465 =
  35. 35.665 − ? = 170
  36. 36.808 + 135 =
  37. 37.A train has 279 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  38. 38.A train has 686 people in the front coaches and 183 people in the back coaches. How many people are on the train?
  39. 39.293 + 267 =
  40. 40.? − 489 = 160

Answer key

  1. 379
  2. 918
  3. 909
  4. 353
  5. 956
  6. 457
  7. 671
  8. 214
  9. 989
  10. 600
  11. 297
  12. 80
  13. 384
  14. 77
  15. 985
  16. 208
  17. 895
  18. 13
  19. 457
  20. 92
  21. 172
  22. 999
  23. 173
  24. 415
  25. 37
  26. 399
  27. 658
  28. 895
  29. 799
  30. 100
  31. 266
  32. 453
  33. 323
  34. 625
  35. 495
  36. 943
  37. 404
  38. 869
  39. 560
  40. 649

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