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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 666 · 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. 1.817 + ? = 926
  2. 2.A train has 394 people in the front coaches and 197 people in the back coaches. How many people are on the train?
  3. 3.582 + 407 =
  4. 4.832 + 124 =
  5. 5.808 + 135 =
  6. 6.723 − 673 =
  7. 7.184 + 376 =
  8. 8.A school has 905 children. 705 of them are girls. How many boys are there?
  9. 9.761 − 312 =
  10. 10.A train has 623 people in the front coaches and 218 people in the back coaches. How many people are on the train?
  11. 11.225 + 227 =
  12. 12.? + 120 = 980
  13. 13.? − 115 = 339
  14. 14.? − 520 = 19
  15. 15.753 − ? = 232
  16. 16.452 + 224 =
  17. 17.? − 201 = 27
  18. 18.A train has 531 people in the front coaches and 244 people in the back coaches. How many people are on the train?
  19. 19.A school has 425 children. 329 of them are girls. How many boys are there?
  20. 20.553 − 316 =
  21. 21.A train has 110 people in the front coaches and 881 people in the back coaches. How many people are on the train?
  22. 22.744 − 147 =
  23. 23.126 + ? = 809
  24. 24.A train has 581 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  25. 25.A train has 384 people in the front coaches and 514 people in the back coaches. How many people are on the train?
  26. 26.509 − ? = 282
  27. 27.844 − 389 =
  28. 28.301 − 111 =
  29. 29.462 + ? = 717
  30. 30.? − 160 = 351
  31. 31.531 − ? = 293
  32. 32.897 − 187 =
  33. 33.? + 778 = 879
  34. 34.A school has 874 children. 268 of them are girls. How many boys are there?
  35. 35.252 − 231 =
  36. 36.A school has 486 children. 224 of them are girls. How many boys are there?
  37. 37.303 − ? = 166
  38. 38.A school has 507 children. 506 of them are girls. How many boys are there?
  39. 39.892 − 737 =
  40. 40.? + 607 = 832

Answer key

  1. 109
  2. 591
  3. 989
  4. 956
  5. 943
  6. 50
  7. 560
  8. 200
  9. 449
  10. 841
  11. 452
  12. 860
  13. 454
  14. 539
  15. 521
  16. 676
  17. 228
  18. 775
  19. 96
  20. 237
  21. 991
  22. 597
  23. 683
  24. 843
  25. 898
  26. 227
  27. 455
  28. 190
  29. 255
  30. 511
  31. 238
  32. 710
  33. 101
  34. 606
  35. 21
  36. 262
  37. 137
  38. 1
  39. 155
  40. 225

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