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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 717 · 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. 1.255 − 247 =
  2. 2.A school has 404 children. 291 of them are girls. How many boys are there?
  3. 3.750 + 101 =
  4. 4.740 − ? = 571
  5. 5.542 + 321 =
  6. 6.A train has 622 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  7. 7.243 + 426 =
  8. 8.A school has 693 children. 561 of them are girls. How many boys are there?
  9. 9.A school has 473 children. 327 of them are girls. How many boys are there?
  10. 10.? + 849 = 954
  11. 11.A school has 630 children. 193 of them are girls. How many boys are there?
  12. 12.A school has 813 children. 443 of them are girls. How many boys are there?
  13. 13.236 − ? = 64
  14. 14.A school has 822 children. 399 of them are girls. How many boys are there?
  15. 15.? − 465 = 262
  16. 16.A train has 569 people in the front coaches and 321 people in the back coaches. How many people are on the train?
  17. 17.362 − 205 =
  18. 18.435 − 100 =
  19. 19.700 + 142 =
  20. 20.473 + 206 =
  21. 21.685 − ? = 499
  22. 22.? + 679 = 958
  23. 23.A school has 795 children. 755 of them are girls. How many boys are there?
  24. 24.689 + ? = 818
  25. 25.534 + 109 =
  26. 26.? + 411 = 684
  27. 27.? − 118 = 721
  28. 28.A school has 490 children. 474 of them are girls. How many boys are there?
  29. 29.712 + ? = 914
  30. 30.595 − 351 =
  31. 31.568 + 225 =
  32. 32.994 − 921 =
  33. 33.665 − 389 =
  34. 34.A train has 864 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  35. 35.667 + 110 =
  36. 36.675 + 158 =
  37. 37.426 − 418 =
  38. 38.A school has 699 children. 128 of them are girls. How many boys are there?
  39. 39.603 + ? = 764
  40. 40.236 − 151 =

Answer key

  1. 8
  2. 113
  3. 851
  4. 169
  5. 863
  6. 892
  7. 669
  8. 132
  9. 146
  10. 105
  11. 437
  12. 370
  13. 172
  14. 423
  15. 727
  16. 890
  17. 157
  18. 335
  19. 842
  20. 679
  21. 186
  22. 279
  23. 40
  24. 129
  25. 643
  26. 273
  27. 839
  28. 16
  29. 202
  30. 244
  31. 793
  32. 73
  33. 276
  34. 979
  35. 777
  36. 833
  37. 8
  38. 571
  39. 161
  40. 85

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