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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 441 · 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.? + 717 = 965
  2. 2.742 + ? = 858
  3. 3.369 + 574 =
  4. 4.695 − ? = 524
  5. 5.A train has 191 people in the front coaches and 356 people in the back coaches. How many people are on the train?
  6. 6.885 + 101 =
  7. 7.A train has 865 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  8. 8.788 − 155 =
  9. 9.628 − 135 =
  10. 10.A school has 650 children. 486 of them are girls. How many boys are there?
  11. 11.837 − 306 =
  12. 12.A train has 399 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  13. 13.A school has 299 children. 174 of them are girls. How many boys are there?
  14. 14.A school has 284 children. 201 of them are girls. How many boys are there?
  15. 15.229 − 141 =
  16. 16.382 − ? = 64
  17. 17.207 − 112 =
  18. 18.A train has 167 people in the front coaches and 626 people in the back coaches. How many people are on the train?
  19. 19.A school has 982 children. 717 of them are girls. How many boys are there?
  20. 20.383 + 305 =
  21. 21.776 − ? = 241
  22. 22.? − 202 = 488
  23. 23.337 − 209 =
  24. 24.? − 527 = 253
  25. 25.368 + 162 =
  26. 26.100 + 558 =
  27. 27.A school has 358 children. 237 of them are girls. How many boys are there?
  28. 28.314 + 224 =
  29. 29.371 − ? = 36
  30. 30.A school has 723 children. 709 of them are girls. How many boys are there?
  31. 31.613 + 313 =
  32. 32.? − 646 = 225
  33. 33.? − 178 = 204
  34. 34.768 + ? = 884
  35. 35.392 + ? = 594
  36. 36.? + 366 = 599
  37. 37.A school has 959 children. 469 of them are girls. How many boys are there?
  38. 38.597 − ? = 150
  39. 39.A train has 382 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  40. 40.277 + 303 =

Answer key

  1. 248
  2. 116
  3. 943
  4. 171
  5. 547
  6. 986
  7. 965
  8. 633
  9. 493
  10. 164
  11. 531
  12. 524
  13. 125
  14. 83
  15. 88
  16. 318
  17. 95
  18. 793
  19. 265
  20. 688
  21. 535
  22. 690
  23. 128
  24. 780
  25. 530
  26. 658
  27. 121
  28. 538
  29. 335
  30. 14
  31. 926
  32. 871
  33. 382
  34. 116
  35. 202
  36. 233
  37. 490
  38. 447
  39. 496
  40. 580

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