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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 179 · 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.? + 205 = 436
  2. 2.A train has 733 people in the front coaches and 166 people in the back coaches. How many people are on the train?
  3. 3.A train has 204 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  4. 4.831 + 147 =
  5. 5.986 − ? = 441
  6. 6.563 + 418 =
  7. 7.778 + 155 =
  8. 8.? + 262 = 711
  9. 9.? + 219 = 922
  10. 10.491 + 368 =
  11. 11.566 + 405 =
  12. 12.479 − 287 =
  13. 13.A school has 477 children. 232 of them are girls. How many boys are there?
  14. 14.865 − 145 =
  15. 15.? − 253 = 383
  16. 16.A school has 335 children. 103 of them are girls. How many boys are there?
  17. 17.A school has 439 children. 138 of them are girls. How many boys are there?
  18. 18.? − 746 = 24
  19. 19.A school has 980 children. 298 of them are girls. How many boys are there?
  20. 20.827 − 716 =
  21. 21.? − 390 = 7
  22. 22.561 − 237 =
  23. 23.A train has 343 people in the front coaches and 495 people in the back coaches. How many people are on the train?
  24. 24.138 + 347 =
  25. 25.A train has 243 people in the front coaches and 485 people in the back coaches. How many people are on the train?
  26. 26.205 − 109 =
  27. 27.A school has 202 children. 134 of them are girls. How many boys are there?
  28. 28.972 − ? = 491
  29. 29.A school has 573 children. 485 of them are girls. How many boys are there?
  30. 30.474 + 312 =
  31. 31.A train has 333 people in the front coaches and 541 people in the back coaches. How many people are on the train?
  32. 32.604 − 153 =
  33. 33.A train has 679 people in the front coaches and 178 people in the back coaches. How many people are on the train?
  34. 34.332 − 293 =
  35. 35.897 + ? = 997
  36. 36.A train has 377 people in the front coaches and 492 people in the back coaches. How many people are on the train?
  37. 37.623 + ? = 985
  38. 38.A school has 742 children. 377 of them are girls. How many boys are there?
  39. 39.? − 351 = 327
  40. 40.A school has 228 children. 188 of them are girls. How many boys are there?

Answer key

  1. 231
  2. 899
  3. 348
  4. 978
  5. 545
  6. 981
  7. 933
  8. 449
  9. 703
  10. 859
  11. 971
  12. 192
  13. 245
  14. 720
  15. 636
  16. 232
  17. 301
  18. 770
  19. 682
  20. 111
  21. 397
  22. 324
  23. 838
  24. 485
  25. 728
  26. 96
  27. 68
  28. 481
  29. 88
  30. 786
  31. 874
  32. 451
  33. 857
  34. 39
  35. 100
  36. 869
  37. 362
  38. 365
  39. 678
  40. 40

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