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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 189 · 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. 1.533 + 242 =
  2. 2.835 + ? = 988
  3. 3.? − 331 = 136
  4. 4.295 − 286 =
  5. 5.A train has 750 people in the front coaches and 169 people in the back coaches. How many people are on the train?
  6. 6.? − 115 = 146
  7. 7.? + 898 = 999
  8. 8.A school has 738 children. 631 of them are girls. How many boys are there?
  9. 9.A train has 513 people in the front coaches and 398 people in the back coaches. How many people are on the train?
  10. 10.A train has 523 people in the front coaches and 227 people in the back coaches. How many people are on the train?
  11. 11.288 − ? = 149
  12. 12.763 − 549 =
  13. 13.865 − ? = 647
  14. 14.? − 336 = 91
  15. 15.A school has 342 children. 168 of them are girls. How many boys are there?
  16. 16.A school has 625 children. 499 of them are girls. How many boys are there?
  17. 17.821 − ? = 693
  18. 18.271 − 217 =
  19. 19.A school has 286 children. 148 of them are girls. How many boys are there?
  20. 20.384 + ? = 864
  21. 21.926 − ? = 389
  22. 22.217 + 738 =
  23. 23.203 + 385 =
  24. 24.A train has 474 people in the front coaches and 410 people in the back coaches. How many people are on the train?
  25. 25.887 − 547 =
  26. 26.A train has 172 people in the front coaches and 310 people in the back coaches. How many people are on the train?
  27. 27.A train has 756 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  28. 28.742 + 152 =
  29. 29.539 + 207 =
  30. 30.381 − 275 =
  31. 31.537 + 451 =
  32. 32.A school has 649 children. 394 of them are girls. How many boys are there?
  33. 33.A school has 972 children. 355 of them are girls. How many boys are there?
  34. 34.? − 224 = 425
  35. 35.393 + ? = 535
  36. 36.A train has 855 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  37. 37.928 − ? = 304
  38. 38.A school has 731 children. 711 of them are girls. How many boys are there?
  39. 39.630 − ? = 414
  40. 40.A train has 134 people in the front coaches and 565 people in the back coaches. How many people are on the train?

Answer key

  1. 775
  2. 153
  3. 467
  4. 9
  5. 919
  6. 261
  7. 101
  8. 107
  9. 911
  10. 750
  11. 139
  12. 214
  13. 218
  14. 427
  15. 174
  16. 126
  17. 128
  18. 54
  19. 138
  20. 480
  21. 537
  22. 955
  23. 588
  24. 884
  25. 340
  26. 482
  27. 883
  28. 894
  29. 746
  30. 106
  31. 988
  32. 255
  33. 617
  34. 649
  35. 142
  36. 967
  37. 624
  38. 20
  39. 216
  40. 699

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