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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 667 · 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.? − 605 = 106
  2. 2.494 + 315 =
  3. 3.322 − 268 =
  4. 4.A train has 323 people in the front coaches and 338 people in the back coaches. How many people are on the train?
  5. 5.217 − 166 =
  6. 6.A school has 894 children. 174 of them are girls. How many boys are there?
  7. 7.821 + 159 =
  8. 8.439 + 202 =
  9. 9.692 − ? = 453
  10. 10.A train has 816 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  11. 11.? − 681 = 94
  12. 12.208 − 101 =
  13. 13.252 + 433 =
  14. 14.256 + ? = 818
  15. 15.144 + 570 =
  16. 16.A train has 751 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  17. 17.A school has 539 children. 293 of them are girls. How many boys are there?
  18. 18.A school has 311 children. 293 of them are girls. How many boys are there?
  19. 19.203 + 225 =
  20. 20.180 + ? = 487
  21. 21.424 − ? = 17
  22. 22.458 + 101 =
  23. 23.A train has 307 people in the front coaches and 312 people in the back coaches. How many people are on the train?
  24. 24.624 + 270 =
  25. 25.789 + 170 =
  26. 26.979 − 449 =
  27. 27.298 − 228 =
  28. 28.506 + 123 =
  29. 29.342 + 127 =
  30. 30.247 + 513 =
  31. 31.582 − 285 =
  32. 32.A train has 249 people in the front coaches and 441 people in the back coaches. How many people are on the train?
  33. 33.? − 249 = 718
  34. 34.A school has 686 children. 233 of them are girls. How many boys are there?
  35. 35.? − 297 = 113
  36. 36.? − 209 = 81
  37. 37.404 − 124 =
  38. 38.872 − 178 =
  39. 39.224 − 198 =
  40. 40.A train has 328 people in the front coaches and 476 people in the back coaches. How many people are on the train?

Answer key

  1. 711
  2. 809
  3. 54
  4. 661
  5. 51
  6. 720
  7. 980
  8. 641
  9. 239
  10. 974
  11. 775
  12. 107
  13. 685
  14. 562
  15. 714
  16. 878
  17. 246
  18. 18
  19. 428
  20. 307
  21. 407
  22. 559
  23. 619
  24. 894
  25. 959
  26. 530
  27. 70
  28. 629
  29. 469
  30. 760
  31. 297
  32. 690
  33. 967
  34. 453
  35. 410
  36. 290
  37. 280
  38. 694
  39. 26
  40. 804

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