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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 783 · 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 699 children. 168 of them are girls. How many boys are there?
  2. 2.A train has 696 people in the front coaches and 218 people in the back coaches. How many people are on the train?
  3. 3.509 + 240 =
  4. 4.312 + 165 =
  5. 5.317 + ? = 431
  6. 6.A train has 358 people in the front coaches and 134 people in the back coaches. How many people are on the train?
  7. 7.962 − 338 =
  8. 8.? + 513 = 884
  9. 9.A train has 276 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  10. 10.? + 258 = 362
  11. 11.394 − 324 =
  12. 12.? + 514 = 821
  13. 13.454 + ? = 640
  14. 14.? − 595 = 340
  15. 15.674 + 120 =
  16. 16.508 − ? = 31
  17. 17.? + 698 = 903
  18. 18.101 + 828 =
  19. 19.182 + 817 =
  20. 20.A train has 499 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  21. 21.A school has 982 children. 136 of them are girls. How many boys are there?
  22. 22.A train has 388 people in the front coaches and 446 people in the back coaches. How many people are on the train?
  23. 23.? − 244 = 641
  24. 24.? − 603 = 15
  25. 25.295 − 251 =
  26. 26.305 + 531 =
  27. 27.A train has 870 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  28. 28.603 − 395 =
  29. 29.? + 716 = 887
  30. 30.510 − 150 =
  31. 31.? + 121 = 557
  32. 32.? + 776 = 894
  33. 33.386 − 220 =
  34. 34.542 − 499 =
  35. 35.A school has 985 children. 821 of them are girls. How many boys are there?
  36. 36.843 + ? = 945
  37. 37.A school has 460 children. 336 of them are girls. How many boys are there?
  38. 38.A school has 948 children. 909 of them are girls. How many boys are there?
  39. 39.331 − 167 =
  40. 40.351 + 215 =

Answer key

  1. 531
  2. 914
  3. 749
  4. 477
  5. 114
  6. 492
  7. 624
  8. 371
  9. 409
  10. 104
  11. 70
  12. 307
  13. 186
  14. 935
  15. 794
  16. 477
  17. 205
  18. 929
  19. 999
  20. 671
  21. 846
  22. 834
  23. 885
  24. 618
  25. 44
  26. 836
  27. 980
  28. 208
  29. 171
  30. 360
  31. 436
  32. 118
  33. 166
  34. 43
  35. 164
  36. 102
  37. 124
  38. 39
  39. 164
  40. 566

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