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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 74 · 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 train has 685 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  2. 2.? − 110 = 330
  3. 3.? + 655 = 841
  4. 4.A train has 535 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  5. 5.A train has 858 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  6. 6.614 − ? = 28
  7. 7.A school has 477 children. 452 of them are girls. How many boys are there?
  8. 8.434 + 119 =
  9. 9.231 + 481 =
  10. 10.A train has 448 people in the front coaches and 289 people in the back coaches. How many people are on the train?
  11. 11.A school has 625 children. 184 of them are girls. How many boys are there?
  12. 12.? + 684 = 926
  13. 13.A school has 732 children. 381 of them are girls. How many boys are there?
  14. 14.805 + ? = 948
  15. 15.A school has 824 children. 151 of them are girls. How many boys are there?
  16. 16.241 + ? = 731
  17. 17.675 − 286 =
  18. 18.852 + 132 =
  19. 19.A school has 308 children. 171 of them are girls. How many boys are there?
  20. 20.A school has 985 children. 722 of them are girls. How many boys are there?
  21. 21.421 − 350 =
  22. 22.780 − 450 =
  23. 23.659 − 263 =
  24. 24.A school has 527 children. 511 of them are girls. How many boys are there?
  25. 25.186 + ? = 746
  26. 26.? − 721 = 20
  27. 27.572 + 371 =
  28. 28.A train has 225 people in the front coaches and 445 people in the back coaches. How many people are on the train?
  29. 29.529 − 482 =
  30. 30.401 − 103 =
  31. 31.389 − 193 =
  32. 32.856 + 130 =
  33. 33.A school has 608 children. 132 of them are girls. How many boys are there?
  34. 34.723 + ? = 980
  35. 35.? − 795 = 70
  36. 36.A train has 164 people in the front coaches and 819 people in the back coaches. How many people are on the train?
  37. 37.? + 161 = 744
  38. 38.766 − 283 =
  39. 39.389 − 130 =
  40. 40.? + 239 = 433

Answer key

  1. 793
  2. 440
  3. 186
  4. 723
  5. 960
  6. 586
  7. 25
  8. 553
  9. 712
  10. 737
  11. 441
  12. 242
  13. 351
  14. 143
  15. 673
  16. 490
  17. 389
  18. 984
  19. 137
  20. 263
  21. 71
  22. 330
  23. 396
  24. 16
  25. 560
  26. 741
  27. 943
  28. 670
  29. 47
  30. 298
  31. 196
  32. 986
  33. 476
  34. 257
  35. 865
  36. 983
  37. 583
  38. 483
  39. 259
  40. 194

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