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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 525 · 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. 1.395 − ? = 115
  2. 2.A train has 293 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  3. 3.A train has 873 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  4. 4.628 + 144 =
  5. 5.686 + 181 =
  6. 6.608 + ? = 798
  7. 7.200 − ? = 40
  8. 8.A train has 410 people in the front coaches and 361 people in the back coaches. How many people are on the train?
  9. 9.801 − 345 =
  10. 10.A train has 851 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  11. 11.? − 155 = 240
  12. 12.801 + 164 =
  13. 13.838 − 779 =
  14. 14.224 + ? = 648
  15. 15.669 + 208 =
  16. 16.585 − 275 =
  17. 17.320 − ? = 108
  18. 18.689 + 119 =
  19. 19.A train has 732 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  20. 20.214 − ? = 12
  21. 21.A train has 713 people in the front coaches and 286 people in the back coaches. How many people are on the train?
  22. 22.691 − ? = 555
  23. 23.A train has 186 people in the front coaches and 388 people in the back coaches. How many people are on the train?
  24. 24.A school has 831 children. 189 of them are girls. How many boys are there?
  25. 25.726 − 586 =
  26. 26.? + 679 = 929
  27. 27.887 + 100 =
  28. 28.? + 612 = 740
  29. 29.230 + 222 =
  30. 30.A school has 379 children. 276 of them are girls. How many boys are there?
  31. 31.? + 472 = 856
  32. 32.873 + 121 =
  33. 33.847 − 421 =
  34. 34.? + 551 = 695
  35. 35.321 + 583 =
  36. 36.A school has 799 children. 698 of them are girls. How many boys are there?
  37. 37.396 + 195 =
  38. 38.699 − 190 =
  39. 39.? − 199 = 6
  40. 40.986 − ? = 598

Answer key

  1. 280
  2. 445
  3. 980
  4. 772
  5. 867
  6. 190
  7. 160
  8. 771
  9. 456
  10. 990
  11. 395
  12. 965
  13. 59
  14. 424
  15. 877
  16. 310
  17. 212
  18. 808
  19. 998
  20. 202
  21. 999
  22. 136
  23. 574
  24. 642
  25. 140
  26. 250
  27. 987
  28. 128
  29. 452
  30. 103
  31. 384
  32. 994
  33. 426
  34. 144
  35. 904
  36. 101
  37. 591
  38. 509
  39. 205
  40. 388

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