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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 389 · 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. 1.384 − ? = 166
  2. 2.A school has 254 children. 247 of them are girls. How many boys are there?
  3. 3.? + 144 = 841
  4. 4.A school has 682 children. 526 of them are girls. How many boys are there?
  5. 5.526 − 427 =
  6. 6.521 + 361 =
  7. 7.A school has 597 children. 430 of them are girls. How many boys are there?
  8. 8.904 − 307 =
  9. 9.360 − 226 =
  10. 10.? + 107 = 681
  11. 11.499 − 490 =
  12. 12.? + 501 = 706
  13. 13.655 + 160 =
  14. 14.A school has 825 children. 778 of them are girls. How many boys are there?
  15. 15.602 − ? = 477
  16. 16.? + 360 = 756
  17. 17.121 + 760 =
  18. 18.641 − 410 =
  19. 19.734 + 118 =
  20. 20.A school has 492 children. 192 of them are girls. How many boys are there?
  21. 21.617 + ? = 949
  22. 22.662 − 104 =
  23. 23.? − 150 = 141
  24. 24.846 + ? = 948
  25. 25.A train has 710 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  26. 26.A school has 925 children. 751 of them are girls. How many boys are there?
  27. 27.604 − 255 =
  28. 28.A school has 315 children. 263 of them are girls. How many boys are there?
  29. 29.340 + 184 =
  30. 30.590 + ? = 852
  31. 31.A school has 202 children. 187 of them are girls. How many boys are there?
  32. 32.139 + ? = 711
  33. 33.880 + 102 =
  34. 34.413 − 294 =
  35. 35.410 − 210 =
  36. 36.A train has 782 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  37. 37.119 + 693 =
  38. 38.624 + 303 =
  39. 39.A school has 273 children. 183 of them are girls. How many boys are there?
  40. 40.873 + ? = 987

Answer key

  1. 218
  2. 7
  3. 697
  4. 156
  5. 99
  6. 882
  7. 167
  8. 597
  9. 134
  10. 574
  11. 9
  12. 205
  13. 815
  14. 47
  15. 125
  16. 396
  17. 881
  18. 231
  19. 852
  20. 300
  21. 332
  22. 558
  23. 291
  24. 102
  25. 849
  26. 174
  27. 349
  28. 52
  29. 524
  30. 262
  31. 15
  32. 572
  33. 982
  34. 119
  35. 200
  36. 899
  37. 812
  38. 927
  39. 90
  40. 114

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