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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 212 · 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. 1.579 + 159 =
  2. 2.A school has 246 children. 195 of them are girls. How many boys are there?
  3. 3.517 − 309 =
  4. 4.A school has 672 children. 241 of them are girls. How many boys are there?
  5. 5.742 − 496 =
  6. 6.324 − 284 =
  7. 7.246 + 725 =
  8. 8.484 − ? = 100
  9. 9.A school has 495 children. 137 of them are girls. How many boys are there?
  10. 10.? + 379 = 704
  11. 11.787 − 132 =
  12. 12.? + 536 = 824
  13. 13.A school has 426 children. 127 of them are girls. How many boys are there?
  14. 14.434 + 213 =
  15. 15.? + 562 = 786
  16. 16.A school has 733 children. 163 of them are girls. How many boys are there?
  17. 17.A school has 756 children. 296 of them are girls. How many boys are there?
  18. 18.536 + 396 =
  19. 19.A train has 575 people in the front coaches and 238 people in the back coaches. How many people are on the train?
  20. 20.? + 789 = 987
  21. 21.857 + 105 =
  22. 22.227 − 197 =
  23. 23.233 + 349 =
  24. 24.A train has 202 people in the front coaches and 526 people in the back coaches. How many people are on the train?
  25. 25.321 − 215 =
  26. 26.236 − 103 =
  27. 27.394 − 129 =
  28. 28.A train has 472 people in the front coaches and 311 people in the back coaches. How many people are on the train?
  29. 29.672 + 215 =
  30. 30.A train has 386 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  31. 31.846 + 101 =
  32. 32.A train has 584 people in the front coaches and 374 people in the back coaches. How many people are on the train?
  33. 33.464 + 283 =
  34. 34.? + 346 = 824
  35. 35.A school has 357 children. 171 of them are girls. How many boys are there?
  36. 36.778 − 572 =
  37. 37.A train has 498 people in the front coaches and 291 people in the back coaches. How many people are on the train?
  38. 38.361 − 335 =
  39. 39.A train has 732 people in the front coaches and 249 people in the back coaches. How many people are on the train?
  40. 40.645 + ? = 763

Answer key

  1. 738
  2. 51
  3. 208
  4. 431
  5. 246
  6. 40
  7. 971
  8. 384
  9. 358
  10. 325
  11. 655
  12. 288
  13. 299
  14. 647
  15. 224
  16. 570
  17. 460
  18. 932
  19. 813
  20. 198
  21. 962
  22. 30
  23. 582
  24. 728
  25. 106
  26. 133
  27. 265
  28. 783
  29. 887
  30. 535
  31. 947
  32. 958
  33. 747
  34. 478
  35. 186
  36. 206
  37. 789
  38. 26
  39. 981
  40. 118

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