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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 50 · 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. 1.366 + 258 =
  2. 2.173 + 647 =
  3. 3.A school has 228 children. 224 of them are girls. How many boys are there?
  4. 4.? − 150 = 245
  5. 5.420 − ? = 158
  6. 6.366 − 161 =
  7. 7.? + 746 = 872
  8. 8.827 − 190 =
  9. 9.A school has 709 children. 687 of them are girls. How many boys are there?
  10. 10.447 + 228 =
  11. 11.A train has 807 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  12. 12.A school has 405 children. 236 of them are girls. How many boys are there?
  13. 13.295 + 571 =
  14. 14.766 + ? = 943
  15. 15.? − 271 = 77
  16. 16.A train has 618 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  17. 17.331 − ? = 126
  18. 18.758 − 282 =
  19. 19.542 − ? = 316
  20. 20.A train has 399 people in the front coaches and 355 people in the back coaches. How many people are on the train?
  21. 21.242 − 161 =
  22. 22.570 − ? = 87
  23. 23.A train has 420 people in the front coaches and 333 people in the back coaches. How many people are on the train?
  24. 24.704 + 139 =
  25. 25.492 − 483 =
  26. 26.? − 469 = 393
  27. 27.652 + 261 =
  28. 28.A school has 497 children. 228 of them are girls. How many boys are there?
  29. 29.A school has 757 children. 375 of them are girls. How many boys are there?
  30. 30.518 − ? = 90
  31. 31.A school has 528 children. 337 of them are girls. How many boys are there?
  32. 32.A train has 288 people in the front coaches and 623 people in the back coaches. How many people are on the train?
  33. 33.? − 246 = 53
  34. 34.395 + 563 =
  35. 35.883 + 110 =
  36. 36.702 − 211 =
  37. 37.673 − 231 =
  38. 38.A train has 736 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  39. 39.904 − ? = 133
  40. 40.? + 861 = 966

Answer key

  1. 624
  2. 820
  3. 4
  4. 395
  5. 262
  6. 205
  7. 126
  8. 637
  9. 22
  10. 675
  11. 969
  12. 169
  13. 866
  14. 177
  15. 348
  16. 798
  17. 205
  18. 476
  19. 226
  20. 754
  21. 81
  22. 483
  23. 753
  24. 843
  25. 9
  26. 862
  27. 913
  28. 269
  29. 382
  30. 428
  31. 191
  32. 911
  33. 299
  34. 958
  35. 993
  36. 491
  37. 442
  38. 931
  39. 771
  40. 105

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