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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 246 · 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 train has 108 people in the front coaches and 650 people in the back coaches. How many people are on the train?
  2. 2.232 + ? = 785
  3. 3.? + 565 = 884
  4. 4.283 + 248 =
  5. 5.881 + ? = 997
  6. 6.A train has 114 people in the front coaches and 311 people in the back coaches. How many people are on the train?
  7. 7.618 − 223 =
  8. 8.A train has 539 people in the front coaches and 368 people in the back coaches. How many people are on the train?
  9. 9.283 − 149 =
  10. 10.A school has 996 children. 815 of them are girls. How many boys are there?
  11. 11.A train has 445 people in the front coaches and 549 people in the back coaches. How many people are on the train?
  12. 12.646 − 332 =
  13. 13.382 − 274 =
  14. 14.482 − ? = 193
  15. 15.? − 246 = 80
  16. 16.A school has 565 children. 526 of them are girls. How many boys are there?
  17. 17.310 − 145 =
  18. 18.A train has 898 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  19. 19.A train has 370 people in the front coaches and 346 people in the back coaches. How many people are on the train?
  20. 20.A school has 927 children. 725 of them are girls. How many boys are there?
  21. 21.325 + 145 =
  22. 22.? − 197 = 615
  23. 23.206 + ? = 571
  24. 24.877 + 100 =
  25. 25.775 − 330 =
  26. 26.880 + ? = 990
  27. 27.A school has 909 children. 655 of them are girls. How many boys are there?
  28. 28.602 − 342 =
  29. 29.332 − 301 =
  30. 30.A school has 470 children. 455 of them are girls. How many boys are there?
  31. 31.347 − ? = 52
  32. 32.? + 102 = 622
  33. 33.A school has 850 children. 203 of them are girls. How many boys are there?
  34. 34.454 + ? = 853
  35. 35.347 − 338 =
  36. 36.A school has 930 children. 186 of them are girls. How many boys are there?
  37. 37.A school has 336 children. 311 of them are girls. How many boys are there?
  38. 38.468 − ? = 74
  39. 39.143 + 549 =
  40. 40.A school has 696 children. 545 of them are girls. How many boys are there?

Answer key

  1. 758
  2. 553
  3. 319
  4. 531
  5. 116
  6. 425
  7. 395
  8. 907
  9. 134
  10. 181
  11. 994
  12. 314
  13. 108
  14. 289
  15. 326
  16. 39
  17. 165
  18. 999
  19. 716
  20. 202
  21. 470
  22. 812
  23. 365
  24. 977
  25. 445
  26. 110
  27. 254
  28. 260
  29. 31
  30. 15
  31. 295
  32. 520
  33. 647
  34. 399
  35. 9
  36. 744
  37. 25
  38. 394
  39. 692
  40. 151

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