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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 803 · 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. 1.864 + 106 =
  2. 2.839 − 419 =
  3. 3.A school has 229 children. 143 of them are girls. How many boys are there?
  4. 4.A train has 228 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  5. 5.739 − ? = 21
  6. 6.A train has 542 people in the front coaches and 213 people in the back coaches. How many people are on the train?
  7. 7.976 − 468 =
  8. 8.657 + 261 =
  9. 9.309 + 186 =
  10. 10.A school has 893 children. 552 of them are girls. How many boys are there?
  11. 11.A train has 578 people in the front coaches and 230 people in the back coaches. How many people are on the train?
  12. 12.435 − 293 =
  13. 13.958 − 580 =
  14. 14.853 + 146 =
  15. 15.? − 484 = 107
  16. 16.? + 626 = 827
  17. 17.A school has 517 children. 217 of them are girls. How many boys are there?
  18. 18.A school has 546 children. 207 of them are girls. How many boys are there?
  19. 19.901 − 232 =
  20. 20.168 + 634 =
  21. 21.A school has 428 children. 204 of them are girls. How many boys are there?
  22. 22.A school has 603 children. 356 of them are girls. How many boys are there?
  23. 23.A school has 408 children. 176 of them are girls. How many boys are there?
  24. 24.972 − ? = 79
  25. 25.? + 325 = 785
  26. 26.298 + 451 =
  27. 27.123 + 591 =
  28. 28.A train has 626 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  29. 29.? − 149 = 200
  30. 30.A train has 448 people in the front coaches and 341 people in the back coaches. How many people are on the train?
  31. 31.962 − 124 =
  32. 32.? − 481 = 300
  33. 33.A school has 361 children. 110 of them are girls. How many boys are there?
  34. 34.417 + 390 =
  35. 35.A train has 258 people in the front coaches and 390 people in the back coaches. How many people are on the train?
  36. 36.809 + 137 =
  37. 37.600 + 238 =
  38. 38.890 + 106 =
  39. 39.768 + 173 =
  40. 40.? + 589 = 761

Answer key

  1. 970
  2. 420
  3. 86
  4. 637
  5. 718
  6. 755
  7. 508
  8. 918
  9. 495
  10. 341
  11. 808
  12. 142
  13. 378
  14. 999
  15. 591
  16. 201
  17. 300
  18. 339
  19. 669
  20. 802
  21. 224
  22. 247
  23. 232
  24. 893
  25. 460
  26. 749
  27. 714
  28. 807
  29. 349
  30. 789
  31. 838
  32. 781
  33. 251
  34. 807
  35. 648
  36. 946
  37. 838
  38. 996
  39. 941
  40. 172

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