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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 675 · 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.? − 138 = 186
  2. 2.379 + 238 =
  3. 3.? − 492 = 274
  4. 4.109 + 261 =
  5. 5.A school has 253 children. 118 of them are girls. How many boys are there?
  6. 6.248 − ? = 138
  7. 7.874 − 392 =
  8. 8.214 − 149 =
  9. 9.745 − ? = 594
  10. 10.800 + 144 =
  11. 11.187 + 161 =
  12. 12.286 + 264 =
  13. 13.? − 352 = 341
  14. 14.837 − 416 =
  15. 15.A train has 829 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  16. 16.? − 235 = 171
  17. 17.A train has 615 people in the front coaches and 174 people in the back coaches. How many people are on the train?
  18. 18.? + 614 = 829
  19. 19.723 − 695 =
  20. 20.335 − ? = 95
  21. 21.? − 354 = 457
  22. 22.310 − ? = 176
  23. 23.600 + 354 =
  24. 24.A train has 329 people in the front coaches and 499 people in the back coaches. How many people are on the train?
  25. 25.419 + 439 =
  26. 26.A school has 764 children. 100 of them are girls. How many boys are there?
  27. 27.A train has 297 people in the front coaches and 507 people in the back coaches. How many people are on the train?
  28. 28.864 + ? = 972
  29. 29.A school has 692 children. 117 of them are girls. How many boys are there?
  30. 30.857 + ? = 967
  31. 31.769 − 445 =
  32. 32.365 − 175 =
  33. 33.A train has 870 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  34. 34.803 + 183 =
  35. 35.? − 366 = 328
  36. 36.? − 116 = 730
  37. 37.806 − 189 =
  38. 38.156 + 640 =
  39. 39.A train has 326 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  40. 40.A train has 747 people in the front coaches and 153 people in the back coaches. How many people are on the train?

Answer key

  1. 324
  2. 617
  3. 766
  4. 370
  5. 135
  6. 110
  7. 482
  8. 65
  9. 151
  10. 944
  11. 348
  12. 550
  13. 693
  14. 421
  15. 949
  16. 406
  17. 789
  18. 215
  19. 28
  20. 240
  21. 811
  22. 134
  23. 954
  24. 828
  25. 858
  26. 664
  27. 804
  28. 108
  29. 575
  30. 110
  31. 324
  32. 190
  33. 971
  34. 986
  35. 694
  36. 846
  37. 617
  38. 796
  39. 517
  40. 900

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