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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 971 · 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. 1.789 + 205 =
  2. 2.410 + 251 =
  3. 3.A train has 268 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  4. 4.A school has 331 children. 247 of them are girls. How many boys are there?
  5. 5.797 − ? = 665
  6. 6.A school has 731 children. 388 of them are girls. How many boys are there?
  7. 7.A school has 816 children. 355 of them are girls. How many boys are there?
  8. 8.832 + 103 =
  9. 9.A school has 507 children. 491 of them are girls. How many boys are there?
  10. 10.A school has 228 children. 109 of them are girls. How many boys are there?
  11. 11.386 + 456 =
  12. 12.A school has 223 children. 211 of them are girls. How many boys are there?
  13. 13.? + 315 = 648
  14. 14.314 − 108 =
  15. 15.? + 629 = 781
  16. 16.661 + 239 =
  17. 17.693 − ? = 456
  18. 18.101 + 562 =
  19. 19.792 − 296 =
  20. 20.855 + 126 =
  21. 21.575 − 467 =
  22. 22.234 − 226 =
  23. 23.A train has 882 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  24. 24.132 + 761 =
  25. 25.415 + 215 =
  26. 26.414 − 381 =
  27. 27.A school has 272 children. 248 of them are girls. How many boys are there?
  28. 28.355 − 148 =
  29. 29.? − 117 = 468
  30. 30.311 + 654 =
  31. 31.365 + 364 =
  32. 32.A train has 686 people in the front coaches and 312 people in the back coaches. How many people are on the train?
  33. 33.627 − 375 =
  34. 34.? + 827 = 929
  35. 35.673 + ? = 781
  36. 36.A train has 118 people in the front coaches and 609 people in the back coaches. How many people are on the train?
  37. 37.136 + 560 =
  38. 38.? + 259 = 912
  39. 39.A school has 425 children. 134 of them are girls. How many boys are there?
  40. 40.364 + 158 =

Answer key

  1. 994
  2. 661
  3. 418
  4. 84
  5. 132
  6. 343
  7. 461
  8. 935
  9. 16
  10. 119
  11. 842
  12. 12
  13. 333
  14. 206
  15. 152
  16. 900
  17. 237
  18. 663
  19. 496
  20. 981
  21. 108
  22. 8
  23. 993
  24. 893
  25. 630
  26. 33
  27. 24
  28. 207
  29. 585
  30. 965
  31. 729
  32. 998
  33. 252
  34. 102
  35. 108
  36. 727
  37. 696
  38. 653
  39. 291
  40. 522

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