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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 493 · 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.? + 502 = 661
  2. 2.? + 786 = 913
  3. 3.A train has 317 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  4. 4.679 + ? = 867
  5. 5.A train has 683 people in the front coaches and 239 people in the back coaches. How many people are on the train?
  6. 6.A train has 342 people in the front coaches and 303 people in the back coaches. How many people are on the train?
  7. 7.A school has 418 children. 289 of them are girls. How many boys are there?
  8. 8.657 − 281 =
  9. 9.? − 438 = 29
  10. 10.A school has 338 children. 181 of them are girls. How many boys are there?
  11. 11.A train has 257 people in the front coaches and 304 people in the back coaches. How many people are on the train?
  12. 12.405 + 228 =
  13. 13.481 + 156 =
  14. 14.171 + 371 =
  15. 15.A train has 180 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  16. 16.492 + 285 =
  17. 17.? + 714 = 929
  18. 18.A train has 162 people in the front coaches and 610 people in the back coaches. How many people are on the train?
  19. 19.608 + 143 =
  20. 20.A train has 396 people in the front coaches and 530 people in the back coaches. How many people are on the train?
  21. 21.529 + 152 =
  22. 22.562 + 213 =
  23. 23.769 − 545 =
  24. 24.821 + ? = 922
  25. 25.A train has 280 people in the front coaches and 621 people in the back coaches. How many people are on the train?
  26. 26.? − 225 = 390
  27. 27.A train has 295 people in the front coaches and 528 people in the back coaches. How many people are on the train?
  28. 28.A school has 814 children. 397 of them are girls. How many boys are there?
  29. 29.A train has 708 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  30. 30.? + 101 = 841
  31. 31.720 + ? = 863
  32. 32.229 − 209 =
  33. 33.A train has 402 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  34. 34.A train has 324 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  35. 35.377 + 458 =
  36. 36.A school has 832 children. 153 of them are girls. How many boys are there?
  37. 37.352 + ? = 459
  38. 38.? + 586 = 888
  39. 39.373 − 184 =
  40. 40.526 + 319 =

Answer key

  1. 159
  2. 127
  3. 539
  4. 188
  5. 922
  6. 645
  7. 129
  8. 376
  9. 467
  10. 157
  11. 561
  12. 633
  13. 637
  14. 542
  15. 305
  16. 777
  17. 215
  18. 772
  19. 751
  20. 926
  21. 681
  22. 775
  23. 224
  24. 101
  25. 901
  26. 615
  27. 823
  28. 417
  29. 815
  30. 740
  31. 143
  32. 20
  33. 509
  34. 447
  35. 835
  36. 679
  37. 107
  38. 302
  39. 189
  40. 845

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