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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 41 · 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. 1.878 + 110 =
  2. 2.208 + 257 =
  3. 3.A school has 508 children. 239 of them are girls. How many boys are there?
  4. 4.226 + ? = 417
  5. 5.A train has 121 people in the front coaches and 624 people in the back coaches. How many people are on the train?
  6. 6.A school has 285 children. 130 of them are girls. How many boys are there?
  7. 7.A school has 245 children. 204 of them are girls. How many boys are there?
  8. 8.A school has 624 children. 107 of them are girls. How many boys are there?
  9. 9.A train has 325 people in the front coaches and 491 people in the back coaches. How many people are on the train?
  10. 10.A train has 306 people in the front coaches and 258 people in the back coaches. How many people are on the train?
  11. 11.116 + ? = 825
  12. 12.714 − 677 =
  13. 13.A train has 844 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  14. 14.692 − 248 =
  15. 15.614 − 516 =
  16. 16.663 + 316 =
  17. 17.432 + ? = 936
  18. 18.A train has 888 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  19. 19.237 + 328 =
  20. 20.323 + 177 =
  21. 21.A train has 784 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  22. 22.? − 167 = 649
  23. 23.411 − 101 =
  24. 24.A train has 782 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  25. 25.674 + 105 =
  26. 26.? + 835 = 935
  27. 27.? + 638 = 822
  28. 28.211 + 351 =
  29. 29.? − 134 = 166
  30. 30.A train has 524 people in the front coaches and 151 people in the back coaches. How many people are on the train?
  31. 31.A train has 482 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  32. 32.A school has 544 children. 320 of them are girls. How many boys are there?
  33. 33.451 − 278 =
  34. 34.429 + 339 =
  35. 35.384 − 238 =
  36. 36.A school has 920 children. 324 of them are girls. How many boys are there?
  37. 37.292 − 178 =
  38. 38.A train has 690 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  39. 39.A school has 310 children. 174 of them are girls. How many boys are there?
  40. 40.241 + 258 =

Answer key

  1. 988
  2. 465
  3. 269
  4. 191
  5. 745
  6. 155
  7. 41
  8. 517
  9. 816
  10. 564
  11. 709
  12. 37
  13. 997
  14. 444
  15. 98
  16. 979
  17. 504
  18. 997
  19. 565
  20. 500
  21. 904
  22. 816
  23. 310
  24. 996
  25. 779
  26. 100
  27. 184
  28. 562
  29. 300
  30. 675
  31. 593
  32. 224
  33. 173
  34. 768
  35. 146
  36. 596
  37. 114
  38. 790
  39. 136
  40. 499

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