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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 229 · 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.A train has 583 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  2. 2.A school has 460 children. 164 of them are girls. How many boys are there?
  3. 3.A school has 261 children. 240 of them are girls. How many boys are there?
  4. 4.243 − ? = 99
  5. 5.329 − 240 =
  6. 6.A school has 348 children. 170 of them are girls. How many boys are there?
  7. 7.367 − ? = 87
  8. 8.A train has 508 people in the front coaches and 284 people in the back coaches. How many people are on the train?
  9. 9.256 + 129 =
  10. 10.A school has 248 children. 230 of them are girls. How many boys are there?
  11. 11.713 + 158 =
  12. 12.397 + 215 =
  13. 13.383 + 252 =
  14. 14.A train has 431 people in the front coaches and 430 people in the back coaches. How many people are on the train?
  15. 15.899 + 100 =
  16. 16.A train has 842 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  17. 17.888 − 870 =
  18. 18.A train has 508 people in the front coaches and 209 people in the back coaches. How many people are on the train?
  19. 19.A school has 742 children. 402 of them are girls. How many boys are there?
  20. 20.? − 248 = 312
  21. 21.785 + 154 =
  22. 22.? + 336 = 629
  23. 23.830 − ? = 539
  24. 24.A train has 206 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  25. 25.A train has 191 people in the front coaches and 795 people in the back coaches. How many people are on the train?
  26. 26.419 − 151 =
  27. 27.? + 670 = 880
  28. 28.573 − 442 =
  29. 29.242 + 105 =
  30. 30.? + 889 = 994
  31. 31.653 − 586 =
  32. 32.A school has 228 children. 223 of them are girls. How many boys are there?
  33. 33.A train has 824 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  34. 34.? − 337 = 28
  35. 35.? − 252 = 88
  36. 36.324 + ? = 855
  37. 37.468 − ? = 348
  38. 38.799 + 129 =
  39. 39.172 + 638 =
  40. 40.279 + 658 =

Answer key

  1. 754
  2. 296
  3. 21
  4. 144
  5. 89
  6. 178
  7. 280
  8. 792
  9. 385
  10. 18
  11. 871
  12. 612
  13. 635
  14. 861
  15. 999
  16. 957
  17. 18
  18. 717
  19. 340
  20. 560
  21. 939
  22. 293
  23. 291
  24. 496
  25. 986
  26. 268
  27. 210
  28. 131
  29. 347
  30. 105
  31. 67
  32. 5
  33. 965
  34. 365
  35. 340
  36. 531
  37. 120
  38. 928
  39. 810
  40. 937

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