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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 793 · 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 857 children. 381 of them are girls. How many boys are there?
  2. 2.? + 269 = 522
  3. 3.A train has 627 people in the front coaches and 277 people in the back coaches. How many people are on the train?
  4. 4.201 + 465 =
  5. 5.889 + ? = 992
  6. 6.A train has 806 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  7. 7.694 + 186 =
  8. 8.A school has 223 children. 130 of them are girls. How many boys are there?
  9. 9.584 + 172 =
  10. 10.A train has 842 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  11. 11.410 − 128 =
  12. 12.A train has 609 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  13. 13.A train has 510 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  14. 14.565 − 237 =
  15. 15.381 + 333 =
  16. 16.841 − ? = 586
  17. 17.815 + ? = 987
  18. 18.799 + ? = 900
  19. 19.? + 382 = 811
  20. 20.349 + 175 =
  21. 21.A school has 506 children. 468 of them are girls. How many boys are there?
  22. 22.346 + 401 =
  23. 23.819 + ? = 923
  24. 24.735 + 178 =
  25. 25.879 + 106 =
  26. 26.A train has 587 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  27. 27.674 + 222 =
  28. 28.A school has 781 children. 253 of them are girls. How many boys are there?
  29. 29.490 − ? = 81
  30. 30.572 − ? = 466
  31. 31.813 − 277 =
  32. 32.821 − ? = 251
  33. 33.485 + 352 =
  34. 34.? − 195 = 98
  35. 35.A train has 511 people in the front coaches and 227 people in the back coaches. How many people are on the train?
  36. 36.? − 290 = 15
  37. 37.629 + 153 =
  38. 38.203 − 122 =
  39. 39.329 − ? = 191
  40. 40.A school has 699 children. 457 of them are girls. How many boys are there?

Answer key

  1. 476
  2. 253
  3. 904
  4. 666
  5. 103
  6. 995
  7. 880
  8. 93
  9. 756
  10. 949
  11. 282
  12. 724
  13. 635
  14. 328
  15. 714
  16. 255
  17. 172
  18. 101
  19. 429
  20. 524
  21. 38
  22. 747
  23. 104
  24. 913
  25. 985
  26. 718
  27. 896
  28. 528
  29. 409
  30. 106
  31. 536
  32. 570
  33. 837
  34. 293
  35. 738
  36. 305
  37. 782
  38. 81
  39. 138
  40. 242

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