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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 800 · 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.? − 241 = 705
  2. 2.758 − 608 =
  3. 3.256 − 232 =
  4. 4.A train has 425 people in the front coaches and 456 people in the back coaches. How many people are on the train?
  5. 5.A train has 209 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  6. 6.? + 199 = 367
  7. 7.275 − 169 =
  8. 8.? − 117 = 194
  9. 9.359 − 100 =
  10. 10.A train has 877 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  11. 11.A train has 891 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  12. 12.464 + ? = 928
  13. 13.561 − ? = 165
  14. 14.965 − 505 =
  15. 15.A school has 891 children. 234 of them are girls. How many boys are there?
  16. 16.A school has 907 children. 279 of them are girls. How many boys are there?
  17. 17.A school has 795 children. 152 of them are girls. How many boys are there?
  18. 18.573 − 195 =
  19. 19.A train has 823 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  20. 20.357 + 238 =
  21. 21.A school has 955 children. 842 of them are girls. How many boys are there?
  22. 22.A school has 659 children. 352 of them are girls. How many boys are there?
  23. 23.A school has 519 children. 441 of them are girls. How many boys are there?
  24. 24.897 + 102 =
  25. 25.A school has 925 children. 161 of them are girls. How many boys are there?
  26. 26.507 − 130 =
  27. 27.A school has 215 children. 148 of them are girls. How many boys are there?
  28. 28.283 − 106 =
  29. 29.A school has 227 children. 144 of them are girls. How many boys are there?
  30. 30.173 + ? = 814
  31. 31.294 − ? = 11
  32. 32.568 + 255 =
  33. 33.917 − 535 =
  34. 34.508 + 466 =
  35. 35.855 − 361 =
  36. 36.270 − ? = 61
  37. 37.? + 761 = 881
  38. 38.104 + 630 =
  39. 39.690 − ? = 231
  40. 40.825 − ? = 460

Answer key

  1. 946
  2. 150
  3. 24
  4. 881
  5. 349
  6. 168
  7. 106
  8. 311
  9. 259
  10. 980
  11. 997
  12. 464
  13. 396
  14. 460
  15. 657
  16. 628
  17. 643
  18. 378
  19. 994
  20. 595
  21. 113
  22. 307
  23. 78
  24. 999
  25. 764
  26. 377
  27. 67
  28. 177
  29. 83
  30. 641
  31. 283
  32. 823
  33. 382
  34. 974
  35. 494
  36. 209
  37. 120
  38. 734
  39. 459
  40. 365

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