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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 630 · 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. 1.482 + 422 =
  2. 2.A train has 789 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  3. 3.204 − 179 =
  4. 4.A school has 246 children. 102 of them are girls. How many boys are there?
  5. 5.A school has 291 children. 220 of them are girls. How many boys are there?
  6. 6.? + 460 = 642
  7. 7.A train has 105 people in the front coaches and 810 people in the back coaches. How many people are on the train?
  8. 8.A school has 528 children. 258 of them are girls. How many boys are there?
  9. 9.137 + ? = 850
  10. 10.898 − 155 =
  11. 11.362 + 632 =
  12. 12.A train has 674 people in the front coaches and 275 people in the back coaches. How many people are on the train?
  13. 13.717 + 189 =
  14. 14.305 + 460 =
  15. 15.A train has 585 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  16. 16.855 − 213 =
  17. 17.619 − ? = 445
  18. 18.334 − ? = 92
  19. 19.? + 442 = 906
  20. 20.551 − 473 =
  21. 21.? − 129 = 103
  22. 22.529 + ? = 704
  23. 23.653 + ? = 872
  24. 24.346 − 240 =
  25. 25.A train has 390 people in the front coaches and 466 people in the back coaches. How many people are on the train?
  26. 26.624 − ? = 320
  27. 27.643 + 171 =
  28. 28.441 − 293 =
  29. 29.151 + ? = 851
  30. 30.A train has 335 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  31. 31.A train has 218 people in the front coaches and 426 people in the back coaches. How many people are on the train?
  32. 32.A school has 262 children. 123 of them are girls. How many boys are there?
  33. 33.492 + 327 =
  34. 34.685 − 642 =
  35. 35.A train has 463 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  36. 36.856 + 124 =
  37. 37.? + 770 = 915
  38. 38.? + 671 = 915
  39. 39.201 + 389 =
  40. 40.864 + ? = 975

Answer key

  1. 904
  2. 926
  3. 25
  4. 144
  5. 71
  6. 182
  7. 915
  8. 270
  9. 713
  10. 743
  11. 994
  12. 949
  13. 906
  14. 765
  15. 855
  16. 642
  17. 174
  18. 242
  19. 464
  20. 78
  21. 232
  22. 175
  23. 219
  24. 106
  25. 856
  26. 304
  27. 814
  28. 148
  29. 700
  30. 529
  31. 644
  32. 139
  33. 819
  34. 43
  35. 771
  36. 980
  37. 145
  38. 244
  39. 590
  40. 111

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