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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 32 · 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. 1.486 + 458 =
  2. 2.A school has 640 children. 451 of them are girls. How many boys are there?
  3. 3.A school has 240 children. 132 of them are girls. How many boys are there?
  4. 4.A train has 179 people in the front coaches and 327 people in the back coaches. How many people are on the train?
  5. 5.A school has 398 children. 301 of them are girls. How many boys are there?
  6. 6.A train has 331 people in the front coaches and 490 people in the back coaches. How many people are on the train?
  7. 7.521 − 406 =
  8. 8.871 − 207 =
  9. 9.529 − ? = 391
  10. 10.? + 728 = 828
  11. 11.A school has 605 children. 501 of them are girls. How many boys are there?
  12. 12.A train has 323 people in the front coaches and 582 people in the back coaches. How many people are on the train?
  13. 13.A train has 591 people in the front coaches and 170 people in the back coaches. How many people are on the train?
  14. 14.? − 127 = 186
  15. 15.815 − ? = 341
  16. 16.614 + 240 =
  17. 17.455 + 346 =
  18. 18.A school has 933 children. 605 of them are girls. How many boys are there?
  19. 19.219 − 195 =
  20. 20.793 + ? = 917
  21. 21.A school has 943 children. 636 of them are girls. How many boys are there?
  22. 22.? + 695 = 987
  23. 23.816 − ? = 175
  24. 24.454 − 175 =
  25. 25.147 + 438 =
  26. 26.? + 792 = 947
  27. 27.831 − 250 =
  28. 28.165 + 788 =
  29. 29.? + 283 = 472
  30. 30.983 − 283 =
  31. 31.? + 710 = 903
  32. 32.A school has 218 children. 126 of them are girls. How many boys are there?
  33. 33.850 − ? = 271
  34. 34.A school has 855 children. 163 of them are girls. How many boys are there?
  35. 35.673 + 188 =
  36. 36.958 − ? = 572
  37. 37.658 + ? = 907
  38. 38.A train has 113 people in the front coaches and 250 people in the back coaches. How many people are on the train?
  39. 39.251 + ? = 501
  40. 40.549 + 379 =

Answer key

  1. 944
  2. 189
  3. 108
  4. 506
  5. 97
  6. 821
  7. 115
  8. 664
  9. 138
  10. 100
  11. 104
  12. 905
  13. 761
  14. 313
  15. 474
  16. 854
  17. 801
  18. 328
  19. 24
  20. 124
  21. 307
  22. 292
  23. 641
  24. 279
  25. 585
  26. 155
  27. 581
  28. 953
  29. 189
  30. 700
  31. 193
  32. 92
  33. 579
  34. 692
  35. 861
  36. 386
  37. 249
  38. 363
  39. 250
  40. 928

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