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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 336 · 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. 1.242 + ? = 384
  2. 2.A school has 566 children. 349 of them are girls. How many boys are there?
  3. 3.712 − 449 =
  4. 4.A train has 705 people in the front coaches and 252 people in the back coaches. How many people are on the train?
  5. 5.554 + ? = 782
  6. 6.214 + 140 =
  7. 7.220 − ? = 67
  8. 8.302 + ? = 920
  9. 9.653 + 106 =
  10. 10.A train has 846 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  11. 11.550 + 129 =
  12. 12.? + 212 = 567
  13. 13.841 + 122 =
  14. 14.638 − 603 =
  15. 15.435 + ? = 943
  16. 16.? − 151 = 270
  17. 17.140 + 789 =
  18. 18.858 − 826 =
  19. 19.A school has 642 children. 602 of them are girls. How many boys are there?
  20. 20.503 + ? = 928
  21. 21.758 − 590 =
  22. 22.633 + 120 =
  23. 23.440 − 184 =
  24. 24.A train has 184 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  25. 25.390 − 376 =
  26. 26.700 − 673 =
  27. 27.828 − 384 =
  28. 28.375 + ? = 483
  29. 29.426 − 413 =
  30. 30.834 + 125 =
  31. 31.A school has 470 children. 352 of them are girls. How many boys are there?
  32. 32.389 − 205 =
  33. 33.A train has 464 people in the front coaches and 234 people in the back coaches. How many people are on the train?
  34. 34.A train has 895 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  35. 35.A train has 645 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  36. 36.A train has 880 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  37. 37.? + 480 = 841
  38. 38.451 − 257 =
  39. 39.631 + 311 =
  40. 40.A train has 558 people in the front coaches and 313 people in the back coaches. How many people are on the train?

Answer key

  1. 142
  2. 217
  3. 263
  4. 957
  5. 228
  6. 354
  7. 153
  8. 618
  9. 759
  10. 958
  11. 679
  12. 355
  13. 963
  14. 35
  15. 508
  16. 421
  17. 929
  18. 32
  19. 40
  20. 425
  21. 168
  22. 753
  23. 256
  24. 313
  25. 14
  26. 27
  27. 444
  28. 108
  29. 13
  30. 959
  31. 118
  32. 184
  33. 698
  34. 998
  35. 841
  36. 995
  37. 361
  38. 194
  39. 942
  40. 871

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