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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 248 · 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.? − 175 = 247
  2. 2.222 − ? = 18
  3. 3.551 − 174 =
  4. 4.222 + 397 =
  5. 5.715 − 300 =
  6. 6.321 + 305 =
  7. 7.932 − 912 =
  8. 8.A school has 399 children. 175 of them are girls. How many boys are there?
  9. 9.119 + ? = 397
  10. 10.337 − 138 =
  11. 11.A train has 121 people in the front coaches and 632 people in the back coaches. How many people are on the train?
  12. 12.A train has 831 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  13. 13.A train has 211 people in the front coaches and 634 people in the back coaches. How many people are on the train?
  14. 14.940 − 161 =
  15. 15.679 − 545 =
  16. 16.A school has 549 children. 248 of them are girls. How many boys are there?
  17. 17.926 − 325 =
  18. 18.235 + 507 =
  19. 19.? − 252 = 260
  20. 20.A train has 841 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  21. 21.523 + 204 =
  22. 22.A train has 687 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  23. 23.683 − ? = 180
  24. 24.A train has 589 people in the front coaches and 205 people in the back coaches. How many people are on the train?
  25. 25.? + 759 = 925
  26. 26.A train has 512 people in the front coaches and 208 people in the back coaches. How many people are on the train?
  27. 27.477 + ? = 656
  28. 28.255 − 118 =
  29. 29.? − 321 = 358
  30. 30.? + 503 = 615
  31. 31.A school has 653 children. 588 of them are girls. How many boys are there?
  32. 32.236 + 304 =
  33. 33.A school has 544 children. 502 of them are girls. How many boys are there?
  34. 34.315 + 346 =
  35. 35.? + 660 = 975
  36. 36.207 + 486 =
  37. 37.A train has 619 people in the front coaches and 248 people in the back coaches. How many people are on the train?
  38. 38.859 − 197 =
  39. 39.533 − 107 =
  40. 40.985 − 469 =

Answer key

  1. 422
  2. 204
  3. 377
  4. 619
  5. 415
  6. 626
  7. 20
  8. 224
  9. 278
  10. 199
  11. 753
  12. 973
  13. 845
  14. 779
  15. 134
  16. 301
  17. 601
  18. 742
  19. 512
  20. 950
  21. 727
  22. 873
  23. 503
  24. 794
  25. 166
  26. 720
  27. 179
  28. 137
  29. 679
  30. 112
  31. 65
  32. 540
  33. 42
  34. 661
  35. 315
  36. 693
  37. 867
  38. 662
  39. 426
  40. 516

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