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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 223 · 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. 1.245 − 145 =
  2. 2.259 + ? = 375
  3. 3.A train has 796 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  4. 4.598 + 229 =
  5. 5.? − 892 = 17
  6. 6.? − 714 = 104
  7. 7.? − 619 = 42
  8. 8.? − 108 = 196
  9. 9.A train has 274 people in the front coaches and 470 people in the back coaches. How many people are on the train?
  10. 10.393 − 275 =
  11. 11.405 + ? = 844
  12. 12.? + 425 = 585
  13. 13.A train has 744 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  14. 14.A train has 892 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  15. 15.A school has 260 children. 156 of them are girls. How many boys are there?
  16. 16.635 − ? = 184
  17. 17.521 − ? = 12
  18. 18.421 + 532 =
  19. 19.? + 283 = 812
  20. 20.A school has 520 children. 161 of them are girls. How many boys are there?
  21. 21.? − 325 = 502
  22. 22.182 + 520 =
  23. 23.256 + 126 =
  24. 24.A train has 594 people in the front coaches and 339 people in the back coaches. How many people are on the train?
  25. 25.372 − ? = 119
  26. 26.? + 763 = 959
  27. 27.983 − 389 =
  28. 28.551 + ? = 809
  29. 29.274 − 162 =
  30. 30.876 − 182 =
  31. 31.314 − 231 =
  32. 32.266 − 208 =
  33. 33.334 + 116 =
  34. 34.A school has 427 children. 224 of them are girls. How many boys are there?
  35. 35.A train has 251 people in the front coaches and 676 people in the back coaches. How many people are on the train?
  36. 36.703 − 106 =
  37. 37.165 + 297 =
  38. 38.681 + 108 =
  39. 39.487 − 388 =
  40. 40.154 + 746 =

Answer key

  1. 100
  2. 116
  3. 900
  4. 827
  5. 909
  6. 818
  7. 661
  8. 304
  9. 744
  10. 118
  11. 439
  12. 160
  13. 877
  14. 994
  15. 104
  16. 451
  17. 509
  18. 953
  19. 529
  20. 359
  21. 827
  22. 702
  23. 382
  24. 933
  25. 253
  26. 196
  27. 594
  28. 258
  29. 112
  30. 694
  31. 83
  32. 58
  33. 450
  34. 203
  35. 927
  36. 597
  37. 462
  38. 789
  39. 99
  40. 900

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