← 3-digit addition and subtraction lesson New set →

Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 321 · 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. 1.261 − ? = 123
  2. 2.A school has 789 children. 561 of them are girls. How many boys are there?
  3. 3.605 − ? = 266
  4. 4.A train has 281 people in the front coaches and 548 people in the back coaches. How many people are on the train?
  5. 5.126 + 802 =
  6. 6.341 + ? = 456
  7. 7.902 − ? = 638
  8. 8.340 + 658 =
  9. 9.A school has 963 children. 244 of them are girls. How many boys are there?
  10. 10.? + 510 = 683
  11. 11.988 − 704 =
  12. 12.A train has 283 people in the front coaches and 624 people in the back coaches. How many people are on the train?
  13. 13.321 + ? = 905
  14. 14.507 + ? = 626
  15. 15.788 + ? = 901
  16. 16.A train has 451 people in the front coaches and 465 people in the back coaches. How many people are on the train?
  17. 17.565 − ? = 257
  18. 18.623 + 135 =
  19. 19.? + 551 = 898
  20. 20.339 + ? = 782
  21. 21.606 + 226 =
  22. 22.A school has 202 children. 186 of them are girls. How many boys are there?
  23. 23.A school has 612 children. 512 of them are girls. How many boys are there?
  24. 24.307 − 104 =
  25. 25.173 + 159 =
  26. 26.475 − 211 =
  27. 27.526 + ? = 668
  28. 28.532 + ? = 744
  29. 29.133 + 371 =
  30. 30.? − 297 = 220
  31. 31.703 + 192 =
  32. 32.A school has 952 children. 817 of them are girls. How many boys are there?
  33. 33.A train has 445 people in the front coaches and 300 people in the back coaches. How many people are on the train?
  34. 34.440 − 347 =
  35. 35.305 + 500 =
  36. 36.221 − 158 =
  37. 37.652 + 110 =
  38. 38.225 + 649 =
  39. 39.393 − 109 =
  40. 40.A train has 834 people in the front coaches and 138 people in the back coaches. How many people are on the train?

Answer key

  1. 138
  2. 228
  3. 339
  4. 829
  5. 928
  6. 115
  7. 264
  8. 998
  9. 719
  10. 173
  11. 284
  12. 907
  13. 584
  14. 119
  15. 113
  16. 916
  17. 308
  18. 758
  19. 347
  20. 443
  21. 832
  22. 16
  23. 100
  24. 203
  25. 332
  26. 264
  27. 142
  28. 212
  29. 504
  30. 517
  31. 895
  32. 135
  33. 745
  34. 93
  35. 805
  36. 63
  37. 762
  38. 874
  39. 284
  40. 972

Free maths worksheets lessons, practice and worksheets at talentjr.in/maths-worksheets