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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 847 · 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.? − 171 = 342
  2. 2.A train has 113 people in the front coaches and 296 people in the back coaches. How many people are on the train?
  3. 3.? + 215 = 559
  4. 4.A school has 917 children. 291 of them are girls. How many boys are there?
  5. 5.447 + 330 =
  6. 6.A school has 763 children. 461 of them are girls. How many boys are there?
  7. 7.A train has 191 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  8. 8.805 + 127 =
  9. 9.? − 402 = 135
  10. 10.A school has 737 children. 586 of them are girls. How many boys are there?
  11. 11.A train has 784 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  12. 12.A train has 611 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  13. 13.? − 638 = 277
  14. 14.A school has 659 children. 520 of them are girls. How many boys are there?
  15. 15.208 + ? = 360
  16. 16.897 + 100 =
  17. 17.377 − 138 =
  18. 18.A train has 267 people in the front coaches and 224 people in the back coaches. How many people are on the train?
  19. 19.A train has 187 people in the front coaches and 696 people in the back coaches. How many people are on the train?
  20. 20.861 − ? = 159
  21. 21.A school has 588 children. 192 of them are girls. How many boys are there?
  22. 22.689 + 227 =
  23. 23.482 + 343 =
  24. 24.A school has 548 children. 259 of them are girls. How many boys are there?
  25. 25.353 − 102 =
  26. 26.A train has 849 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  27. 27.727 + 178 =
  28. 28.? − 446 = 248
  29. 29.A train has 168 people in the front coaches and 476 people in the back coaches. How many people are on the train?
  30. 30.665 − 147 =
  31. 31.764 + ? = 874
  32. 32.? − 157 = 506
  33. 33.378 + 477 =
  34. 34.A school has 880 children. 377 of them are girls. How many boys are there?
  35. 35.690 − 274 =
  36. 36.A school has 384 children. 362 of them are girls. How many boys are there?
  37. 37.400 + ? = 790
  38. 38.657 + 246 =
  39. 39.762 − 419 =
  40. 40.? + 394 = 786

Answer key

  1. 513
  2. 409
  3. 344
  4. 626
  5. 777
  6. 302
  7. 515
  8. 932
  9. 537
  10. 151
  11. 998
  12. 725
  13. 915
  14. 139
  15. 152
  16. 997
  17. 239
  18. 491
  19. 883
  20. 702
  21. 396
  22. 916
  23. 825
  24. 289
  25. 251
  26. 969
  27. 905
  28. 694
  29. 644
  30. 518
  31. 110
  32. 663
  33. 855
  34. 503
  35. 416
  36. 22
  37. 390
  38. 903
  39. 343
  40. 392

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