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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 393 · 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. 1.829 + 110 =
  2. 2.A train has 223 people in the front coaches and 323 people in the back coaches. How many people are on the train?
  3. 3.724 + 205 =
  4. 4.751 + ? = 996
  5. 5.977 − ? = 515
  6. 6.263 − 124 =
  7. 7.A school has 538 children. 352 of them are girls. How many boys are there?
  8. 8.706 − 488 =
  9. 9.149 + ? = 710
  10. 10.? + 540 = 692
  11. 11.921 − 761 =
  12. 12.? − 203 = 177
  13. 13.894 + 101 =
  14. 14.? + 601 = 897
  15. 15.214 − ? = 44
  16. 16.A school has 891 children. 212 of them are girls. How many boys are there?
  17. 17.A train has 138 people in the front coaches and 382 people in the back coaches. How many people are on the train?
  18. 18.A school has 824 children. 723 of them are girls. How many boys are there?
  19. 19.430 − 224 =
  20. 20.979 − 690 =
  21. 21.243 + 142 =
  22. 22.698 + 136 =
  23. 23.? + 763 = 970
  24. 24.803 + ? = 908
  25. 25.? + 382 = 643
  26. 26.392 − ? = 256
  27. 27.? − 141 = 157
  28. 28.A school has 923 children. 482 of them are girls. How many boys are there?
  29. 29.A train has 428 people in the front coaches and 145 people in the back coaches. How many people are on the train?
  30. 30.A school has 937 children. 847 of them are girls. How many boys are there?
  31. 31.A train has 874 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  32. 32.? + 648 = 808
  33. 33.A train has 423 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  34. 34.A school has 209 children. 111 of them are girls. How many boys are there?
  35. 35.? − 116 = 97
  36. 36.A train has 834 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  37. 37.A school has 561 children. 420 of them are girls. How many boys are there?
  38. 38.A train has 829 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  39. 39.A school has 417 children. 281 of them are girls. How many boys are there?
  40. 40.? − 726 = 156

Answer key

  1. 939
  2. 546
  3. 929
  4. 245
  5. 462
  6. 139
  7. 186
  8. 218
  9. 561
  10. 152
  11. 160
  12. 380
  13. 995
  14. 296
  15. 170
  16. 679
  17. 520
  18. 101
  19. 206
  20. 289
  21. 385
  22. 834
  23. 207
  24. 105
  25. 261
  26. 136
  27. 298
  28. 441
  29. 573
  30. 90
  31. 990
  32. 160
  33. 689
  34. 98
  35. 213
  36. 949
  37. 141
  38. 930
  39. 136
  40. 882

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