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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 105 · 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 school has 904 children. 153 of them are girls. How many boys are there?
  2. 2.247 + 543 =
  3. 3.A school has 528 children. 363 of them are girls. How many boys are there?
  4. 4.? + 706 = 907
  5. 5.187 + 724 =
  6. 6.A train has 625 people in the front coaches and 335 people in the back coaches. How many people are on the train?
  7. 7.117 + 835 =
  8. 8.757 − 203 =
  9. 9.585 + 155 =
  10. 10.495 + 446 =
  11. 11.? + 128 = 751
  12. 12.761 − ? = 214
  13. 13.223 − 153 =
  14. 14.238 − ? = 16
  15. 15.A train has 353 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  16. 16.612 + 340 =
  17. 17.348 + 413 =
  18. 18.550 − 547 =
  19. 19.? − 116 = 382
  20. 20.272 − 231 =
  21. 21.A train has 284 people in the front coaches and 541 people in the back coaches. How many people are on the train?
  22. 22.? + 743 = 928
  23. 23.674 − 657 =
  24. 24.327 + ? = 994
  25. 25.? + 177 = 761
  26. 26.808 − 305 =
  27. 27.A train has 847 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  28. 28.616 − ? = 202
  29. 29.800 + 103 =
  30. 30.506 + ? = 707
  31. 31.480 + 427 =
  32. 32.A school has 398 children. 119 of them are girls. How many boys are there?
  33. 33.449 − ? = 21
  34. 34.A train has 143 people in the front coaches and 192 people in the back coaches. How many people are on the train?
  35. 35.779 − 772 =
  36. 36.794 − 230 =
  37. 37.A school has 592 children. 366 of them are girls. How many boys are there?
  38. 38.835 + 136 =
  39. 39.514 + 372 =
  40. 40.A school has 210 children. 112 of them are girls. How many boys are there?

Answer key

  1. 751
  2. 790
  3. 165
  4. 201
  5. 911
  6. 960
  7. 952
  8. 554
  9. 740
  10. 941
  11. 623
  12. 547
  13. 70
  14. 222
  15. 454
  16. 952
  17. 761
  18. 3
  19. 498
  20. 41
  21. 825
  22. 185
  23. 17
  24. 667
  25. 584
  26. 503
  27. 989
  28. 414
  29. 903
  30. 201
  31. 907
  32. 279
  33. 428
  34. 335
  35. 7
  36. 564
  37. 226
  38. 971
  39. 886
  40. 98

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