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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 875 · 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. 1.468 + 242 =
  2. 2.A school has 253 children. 106 of them are girls. How many boys are there?
  3. 3.226 − 220 =
  4. 4.A school has 640 children. 439 of them are girls. How many boys are there?
  5. 5.? − 793 = 186
  6. 6.A school has 244 children. 152 of them are girls. How many boys are there?
  7. 7.583 − 133 =
  8. 8.453 + 294 =
  9. 9.748 + 117 =
  10. 10.278 − 158 =
  11. 11.575 − ? = 339
  12. 12.333 − 309 =
  13. 13.354 + 202 =
  14. 14.620 + ? = 720
  15. 15.611 + 243 =
  16. 16.A school has 666 children. 216 of them are girls. How many boys are there?
  17. 17.427 + ? = 676
  18. 18.458 − 224 =
  19. 19.A train has 110 people in the front coaches and 648 people in the back coaches. How many people are on the train?
  20. 20.145 + 342 =
  21. 21.694 − 125 =
  22. 22.? − 453 = 75
  23. 23.957 − ? = 439
  24. 24.A train has 158 people in the front coaches and 716 people in the back coaches. How many people are on the train?
  25. 25.100 + 523 =
  26. 26.? − 103 = 435
  27. 27.A train has 237 people in the front coaches and 597 people in the back coaches. How many people are on the train?
  28. 28.534 + ? = 992
  29. 29.697 + ? = 998
  30. 30.A train has 259 people in the front coaches and 321 people in the back coaches. How many people are on the train?
  31. 31.549 + 193 =
  32. 32.557 − 308 =
  33. 33.587 − ? = 463
  34. 34.273 + ? = 736
  35. 35.798 + ? = 916
  36. 36.A school has 211 children. 141 of them are girls. How many boys are there?
  37. 37.218 + ? = 696
  38. 38.A school has 551 children. 353 of them are girls. How many boys are there?
  39. 39.A train has 789 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  40. 40.A school has 323 children. 171 of them are girls. How many boys are there?

Answer key

  1. 710
  2. 147
  3. 6
  4. 201
  5. 979
  6. 92
  7. 450
  8. 747
  9. 865
  10. 120
  11. 236
  12. 24
  13. 556
  14. 100
  15. 854
  16. 450
  17. 249
  18. 234
  19. 758
  20. 487
  21. 569
  22. 528
  23. 518
  24. 874
  25. 623
  26. 538
  27. 834
  28. 458
  29. 301
  30. 580
  31. 742
  32. 249
  33. 124
  34. 463
  35. 118
  36. 70
  37. 478
  38. 198
  39. 968
  40. 152

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