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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 243 · 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 128 people in the front coaches and 405 people in the back coaches. How many people are on the train?
  2. 2.A train has 210 people in the front coaches and 619 people in the back coaches. How many people are on the train?
  3. 3.A school has 556 children. 270 of them are girls. How many boys are there?
  4. 4.A train has 622 people in the front coaches and 348 people in the back coaches. How many people are on the train?
  5. 5.883 + 111 =
  6. 6.A school has 797 children. 159 of them are girls. How many boys are there?
  7. 7.? − 749 = 249
  8. 8.A train has 867 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  9. 9.452 + 491 =
  10. 10.? − 448 = 479
  11. 11.923 − ? = 538
  12. 12.278 + 265 =
  13. 13.532 + ? = 673
  14. 14.332 + 140 =
  15. 15.? − 122 = 179
  16. 16.A train has 880 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  17. 17.601 − ? = 494
  18. 18.614 + 169 =
  19. 19.? + 461 = 925
  20. 20.538 + 380 =
  21. 21.A train has 250 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  22. 22.831 − 208 =
  23. 23.256 + 664 =
  24. 24.545 + ? = 876
  25. 25.252 + ? = 429
  26. 26.? − 527 = 233
  27. 27.? + 684 = 857
  28. 28.554 + 116 =
  29. 29.? + 498 = 750
  30. 30.A school has 234 children. 192 of them are girls. How many boys are there?
  31. 31.A school has 349 children. 162 of them are girls. How many boys are there?
  32. 32.376 + 201 =
  33. 33.271 + 278 =
  34. 34.757 + 182 =
  35. 35.446 + 221 =
  36. 36.658 + 275 =
  37. 37.666 + 125 =
  38. 38.A train has 175 people in the front coaches and 418 people in the back coaches. How many people are on the train?
  39. 39.A train has 335 people in the front coaches and 417 people in the back coaches. How many people are on the train?
  40. 40.728 + 135 =

Answer key

  1. 533
  2. 829
  3. 286
  4. 970
  5. 994
  6. 638
  7. 998
  8. 973
  9. 943
  10. 927
  11. 385
  12. 543
  13. 141
  14. 472
  15. 301
  16. 991
  17. 107
  18. 783
  19. 464
  20. 918
  21. 366
  22. 623
  23. 920
  24. 331
  25. 177
  26. 760
  27. 173
  28. 670
  29. 252
  30. 42
  31. 187
  32. 577
  33. 549
  34. 939
  35. 667
  36. 933
  37. 791
  38. 593
  39. 752
  40. 863

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