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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 20 · 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. 1.597 + 154 =
  2. 2.A school has 430 children. 282 of them are girls. How many boys are there?
  3. 3.A train has 525 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  4. 4.125 + ? = 384
  5. 5.A train has 728 people in the front coaches and 263 people in the back coaches. How many people are on the train?
  6. 6.311 − 168 =
  7. 7.521 + 203 =
  8. 8.? + 296 = 684
  9. 9.233 − ? = 74
  10. 10.A school has 690 children. 513 of them are girls. How many boys are there?
  11. 11.291 + 402 =
  12. 12.287 − ? = 36
  13. 13.652 + ? = 776
  14. 14.A train has 547 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  15. 15.826 − 793 =
  16. 16.A school has 738 children. 667 of them are girls. How many boys are there?
  17. 17.392 − 288 =
  18. 18.806 − 240 =
  19. 19.A train has 221 people in the front coaches and 182 people in the back coaches. How many people are on the train?
  20. 20.120 + 814 =
  21. 21.352 − 217 =
  22. 22.407 − 150 =
  23. 23.817 − 276 =
  24. 24.835 + 119 =
  25. 25.318 − 142 =
  26. 26.? − 173 = 774
  27. 27.A train has 686 people in the front coaches and 313 people in the back coaches. How many people are on the train?
  28. 28.? − 335 = 2
  29. 29.? − 567 = 32
  30. 30.272 + 331 =
  31. 31.A train has 512 people in the front coaches and 476 people in the back coaches. How many people are on the train?
  32. 32.A school has 272 children. 197 of them are girls. How many boys are there?
  33. 33.A school has 524 children. 341 of them are girls. How many boys are there?
  34. 34.687 − 449 =
  35. 35.289 − 126 =
  36. 36.219 + ? = 576
  37. 37.844 + 152 =
  38. 38.? − 601 = 181
  39. 39.A school has 466 children. 330 of them are girls. How many boys are there?
  40. 40.A school has 450 children. 134 of them are girls. How many boys are there?

Answer key

  1. 751
  2. 148
  3. 831
  4. 259
  5. 991
  6. 143
  7. 724
  8. 388
  9. 159
  10. 177
  11. 693
  12. 251
  13. 124
  14. 748
  15. 33
  16. 71
  17. 104
  18. 566
  19. 403
  20. 934
  21. 135
  22. 257
  23. 541
  24. 954
  25. 176
  26. 947
  27. 999
  28. 337
  29. 599
  30. 603
  31. 988
  32. 75
  33. 183
  34. 238
  35. 163
  36. 357
  37. 996
  38. 782
  39. 136
  40. 316

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