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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 566 · 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 502 people in the front coaches and 471 people in the back coaches. How many people are on the train?
  2. 2.? + 268 = 663
  3. 3.? − 533 = 310
  4. 4.A school has 568 children. 162 of them are girls. How many boys are there?
  5. 5.830 + 109 =
  6. 6.855 + 130 =
  7. 7.? + 804 = 926
  8. 8.A school has 791 children. 697 of them are girls. How many boys are there?
  9. 9.? − 725 = 258
  10. 10.292 − ? = 9
  11. 11.250 + 687 =
  12. 12.? + 555 = 808
  13. 13.A school has 916 children. 803 of them are girls. How many boys are there?
  14. 14.A train has 471 people in the front coaches and 197 people in the back coaches. How many people are on the train?
  15. 15.330 − ? = 38
  16. 16.368 − 133 =
  17. 17.A school has 423 children. 364 of them are girls. How many boys are there?
  18. 18.814 + 143 =
  19. 19.466 − ? = 301
  20. 20.A school has 746 children. 131 of them are girls. How many boys are there?
  21. 21.228 + ? = 497
  22. 22.263 + 421 =
  23. 23.A train has 353 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  24. 24.? − 429 = 125
  25. 25.A train has 849 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  26. 26.578 − 421 =
  27. 27.844 + 110 =
  28. 28.A school has 569 children. 146 of them are girls. How many boys are there?
  29. 29.A school has 447 children. 286 of them are girls. How many boys are there?
  30. 30.A train has 123 people in the front coaches and 720 people in the back coaches. How many people are on the train?
  31. 31.? + 586 = 854
  32. 32.A train has 486 people in the front coaches and 332 people in the back coaches. How many people are on the train?
  33. 33.? − 621 = 264
  34. 34.246 − 152 =
  35. 35.746 + ? = 869
  36. 36.204 − 200 =
  37. 37.540 + ? = 755
  38. 38.395 − 284 =
  39. 39.454 + ? = 616
  40. 40.261 − 157 =

Answer key

  1. 973
  2. 395
  3. 843
  4. 406
  5. 939
  6. 985
  7. 122
  8. 94
  9. 983
  10. 283
  11. 937
  12. 253
  13. 113
  14. 668
  15. 292
  16. 235
  17. 59
  18. 957
  19. 165
  20. 615
  21. 269
  22. 684
  23. 466
  24. 554
  25. 991
  26. 157
  27. 954
  28. 423
  29. 161
  30. 843
  31. 268
  32. 818
  33. 885
  34. 94
  35. 123
  36. 4
  37. 215
  38. 111
  39. 162
  40. 104

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