← 3-digit addition and subtraction lesson New set →

Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 270 · 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.A school has 775 children. 521 of them are girls. How many boys are there?
  2. 2.A train has 176 people in the front coaches and 823 people in the back coaches. How many people are on the train?
  3. 3.A school has 765 children. 335 of them are girls. How many boys are there?
  4. 4.722 + ? = 966
  5. 5.158 + ? = 308
  6. 6.? − 252 = 498
  7. 7.? − 124 = 596
  8. 8.228 − 207 =
  9. 9.A train has 321 people in the front coaches and 505 people in the back coaches. How many people are on the train?
  10. 10.171 + 587 =
  11. 11.387 + 217 =
  12. 12.749 + ? = 970
  13. 13.487 − 147 =
  14. 14.A school has 719 children. 385 of them are girls. How many boys are there?
  15. 15.A school has 633 children. 346 of them are girls. How many boys are there?
  16. 16.? − 460 = 127
  17. 17.300 + 684 =
  18. 18.131 + 667 =
  19. 19.898 − 386 =
  20. 20.A train has 467 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  21. 21.210 + 351 =
  22. 22.222 + 460 =
  23. 23.816 + ? = 948
  24. 24.? + 384 = 552
  25. 25.656 + 197 =
  26. 26.? − 411 = 302
  27. 27.792 + 204 =
  28. 28.896 − ? = 632
  29. 29.? + 410 = 809
  30. 30.? + 420 = 837
  31. 31.566 + 179 =
  32. 32.? + 543 = 723
  33. 33.A train has 180 people in the front coaches and 204 people in the back coaches. How many people are on the train?
  34. 34.805 + ? = 926
  35. 35.? + 255 = 452
  36. 36.555 + 229 =
  37. 37.A school has 295 children. 256 of them are girls. How many boys are there?
  38. 38.A school has 319 children. 201 of them are girls. How many boys are there?
  39. 39.304 − ? = 65
  40. 40.168 + ? = 751

Answer key

  1. 254
  2. 999
  3. 430
  4. 244
  5. 150
  6. 750
  7. 720
  8. 21
  9. 826
  10. 758
  11. 604
  12. 221
  13. 340
  14. 334
  15. 287
  16. 587
  17. 984
  18. 798
  19. 512
  20. 580
  21. 561
  22. 682
  23. 132
  24. 168
  25. 853
  26. 713
  27. 996
  28. 264
  29. 399
  30. 417
  31. 745
  32. 180
  33. 384
  34. 121
  35. 197
  36. 784
  37. 39
  38. 118
  39. 239
  40. 583

Free maths worksheets lessons, practice and worksheets at talentjr.in/maths-worksheets