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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 40 · 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. 1.135 + 157 =
  2. 2.803 + 171 =
  3. 3.356 − ? = 114
  4. 4.? + 564 = 901
  5. 5.? + 680 = 784
  6. 6.524 + 232 =
  7. 7.? + 726 = 973
  8. 8.403 + ? = 562
  9. 9.A train has 809 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  10. 10.782 + 139 =
  11. 11.484 + 304 =
  12. 12.218 − ? = 2
  13. 13.855 + ? = 980
  14. 14.456 − 108 =
  15. 15.576 + 215 =
  16. 16.228 − 128 =
  17. 17.214 + 261 =
  18. 18.A train has 551 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  19. 19.? + 380 = 883
  20. 20.? − 345 = 604
  21. 21.A train has 473 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  22. 22.A train has 359 people in the front coaches and 606 people in the back coaches. How many people are on the train?
  23. 23.A school has 458 children. 303 of them are girls. How many boys are there?
  24. 24.219 − 100 =
  25. 25.796 − 578 =
  26. 26.445 − 175 =
  27. 27.549 + ? = 835
  28. 28.163 + 216 =
  29. 29.226 − ? = 22
  30. 30.A school has 546 children. 278 of them are girls. How many boys are there?
  31. 31.914 − 369 =
  32. 32.210 − ? = 48
  33. 33.792 − 439 =
  34. 34.A train has 332 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  35. 35.940 − 697 =
  36. 36.A school has 795 children. 403 of them are girls. How many boys are there?
  37. 37.A train has 699 people in the front coaches and 225 people in the back coaches. How many people are on the train?
  38. 38.A school has 362 children. 254 of them are girls. How many boys are there?
  39. 39.606 + 259 =
  40. 40.247 + ? = 755

Answer key

  1. 292
  2. 974
  3. 242
  4. 337
  5. 104
  6. 756
  7. 247
  8. 159
  9. 914
  10. 921
  11. 788
  12. 216
  13. 125
  14. 348
  15. 791
  16. 100
  17. 475
  18. 752
  19. 503
  20. 949
  21. 589
  22. 965
  23. 155
  24. 119
  25. 218
  26. 270
  27. 286
  28. 379
  29. 204
  30. 268
  31. 545
  32. 162
  33. 353
  34. 594
  35. 243
  36. 392
  37. 924
  38. 108
  39. 865
  40. 508

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