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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 970 · 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. 1.671 − 367 =
  2. 2.162 + 265 =
  3. 3.534 + 414 =
  4. 4.A train has 135 people in the front coaches and 599 people in the back coaches. How many people are on the train?
  5. 5.147 + 720 =
  6. 6.? − 112 = 106
  7. 7.A school has 398 children. 370 of them are girls. How many boys are there?
  8. 8.A train has 184 people in the front coaches and 345 people in the back coaches. How many people are on the train?
  9. 9.962 − 648 =
  10. 10.545 − ? = 264
  11. 11.A school has 748 children. 208 of them are girls. How many boys are there?
  12. 12.328 + 266 =
  13. 13.? + 654 = 755
  14. 14.A train has 871 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  15. 15.A train has 221 people in the front coaches and 696 people in the back coaches. How many people are on the train?
  16. 16.A train has 614 people in the front coaches and 304 people in the back coaches. How many people are on the train?
  17. 17.276 − 102 =
  18. 18.827 + 159 =
  19. 19.? + 309 = 442
  20. 20.944 − 133 =
  21. 21.A school has 585 children. 144 of them are girls. How many boys are there?
  22. 22.665 + ? = 896
  23. 23.? + 455 = 685
  24. 24.861 + ? = 970
  25. 25.617 − ? = 346
  26. 26.A train has 615 people in the front coaches and 275 people in the back coaches. How many people are on the train?
  27. 27.A train has 744 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  28. 28.A train has 443 people in the front coaches and 310 people in the back coaches. How many people are on the train?
  29. 29.A school has 735 children. 652 of them are girls. How many boys are there?
  30. 30.916 − 334 =
  31. 31.889 + ? = 993
  32. 32.A school has 305 children. 188 of them are girls. How many boys are there?
  33. 33.206 − 119 =
  34. 34.322 + 545 =
  35. 35.A school has 965 children. 446 of them are girls. How many boys are there?
  36. 36.123 + ? = 854
  37. 37.? + 869 = 972
  38. 38.A school has 496 children. 318 of them are girls. How many boys are there?
  39. 39.319 + ? = 844
  40. 40.A school has 902 children. 254 of them are girls. How many boys are there?

Answer key

  1. 304
  2. 427
  3. 948
  4. 734
  5. 867
  6. 218
  7. 28
  8. 529
  9. 314
  10. 281
  11. 540
  12. 594
  13. 101
  14. 975
  15. 917
  16. 918
  17. 174
  18. 986
  19. 133
  20. 811
  21. 441
  22. 231
  23. 230
  24. 109
  25. 271
  26. 890
  27. 845
  28. 753
  29. 83
  30. 582
  31. 104
  32. 117
  33. 87
  34. 867
  35. 519
  36. 731
  37. 103
  38. 178
  39. 525
  40. 648

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