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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 292 · 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. 1.230 − 228 =
  2. 2.606 + ? = 921
  3. 3.248 + 609 =
  4. 4.840 + 138 =
  5. 5.511 − 309 =
  6. 6.? + 817 = 918
  7. 7.819 + 120 =
  8. 8.A school has 233 children. 182 of them are girls. How many boys are there?
  9. 9.802 + 103 =
  10. 10.312 − 154 =
  11. 11.? − 148 = 305
  12. 12.A school has 970 children. 800 of them are girls. How many boys are there?
  13. 13.A train has 757 people in the front coaches and 223 people in the back coaches. How many people are on the train?
  14. 14.A train has 377 people in the front coaches and 559 people in the back coaches. How many people are on the train?
  15. 15.107 + 741 =
  16. 16.842 − ? = 159
  17. 17.A school has 341 children. 134 of them are girls. How many boys are there?
  18. 18.782 + 102 =
  19. 19.591 + ? = 694
  20. 20.266 − 156 =
  21. 21.848 + ? = 955
  22. 22.278 + ? = 776
  23. 23.727 − 176 =
  24. 24.? + 676 = 788
  25. 25.471 − ? = 179
  26. 26.343 + 611 =
  27. 27.A train has 619 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  28. 28.A train has 756 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  29. 29.675 − 547 =
  30. 30.346 + 199 =
  31. 31.783 − 608 =
  32. 32.A school has 851 children. 791 of them are girls. How many boys are there?
  33. 33.539 + 105 =
  34. 34.306 − 147 =
  35. 35.898 + 101 =
  36. 36.A school has 874 children. 789 of them are girls. How many boys are there?
  37. 37.559 − 296 =
  38. 38.209 + 400 =
  39. 39.A train has 501 people in the front coaches and 448 people in the back coaches. How many people are on the train?
  40. 40.916 − ? = 343

Answer key

  1. 2
  2. 315
  3. 857
  4. 978
  5. 202
  6. 101
  7. 939
  8. 51
  9. 905
  10. 158
  11. 453
  12. 170
  13. 980
  14. 936
  15. 848
  16. 683
  17. 207
  18. 884
  19. 103
  20. 110
  21. 107
  22. 498
  23. 551
  24. 112
  25. 292
  26. 954
  27. 909
  28. 872
  29. 128
  30. 545
  31. 175
  32. 60
  33. 644
  34. 159
  35. 999
  36. 85
  37. 263
  38. 609
  39. 949
  40. 573

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