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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 287 · 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 314 people in the front coaches and 411 people in the back coaches. How many people are on the train?
  2. 2.? + 220 = 770
  3. 3.407 − 132 =
  4. 4.892 − ? = 409
  5. 5.910 − 367 =
  6. 6.288 − ? = 121
  7. 7.299 − 199 =
  8. 8.514 + 139 =
  9. 9.A train has 307 people in the front coaches and 514 people in the back coaches. How many people are on the train?
  10. 10.494 − 188 =
  11. 11.315 − 295 =
  12. 12.A train has 266 people in the front coaches and 454 people in the back coaches. How many people are on the train?
  13. 13.922 − 381 =
  14. 14.435 + 174 =
  15. 15.A school has 854 children. 731 of them are girls. How many boys are there?
  16. 16.A train has 439 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  17. 17.? − 201 = 81
  18. 18.380 − 153 =
  19. 19.793 + 101 =
  20. 20.285 − 236 =
  21. 21.918 − 275 =
  22. 22.? + 811 = 980
  23. 23.258 − ? = 79
  24. 24.587 + 194 =
  25. 25.341 + ? = 689
  26. 26.? + 655 = 787
  27. 27.? + 670 = 903
  28. 28.608 + 208 =
  29. 29.A train has 869 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  30. 30.A school has 837 children. 700 of them are girls. How many boys are there?
  31. 31.964 − 717 =
  32. 32.A train has 734 people in the front coaches and 155 people in the back coaches. How many people are on the train?
  33. 33.659 − 513 =
  34. 34.A train has 415 people in the front coaches and 450 people in the back coaches. How many people are on the train?
  35. 35.829 + 145 =
  36. 36.393 − 166 =
  37. 37.A train has 139 people in the front coaches and 352 people in the back coaches. How many people are on the train?
  38. 38.784 + 201 =
  39. 39.860 − 265 =
  40. 40.250 − 169 =

Answer key

  1. 725
  2. 550
  3. 275
  4. 483
  5. 543
  6. 167
  7. 100
  8. 653
  9. 821
  10. 306
  11. 20
  12. 720
  13. 541
  14. 609
  15. 123
  16. 623
  17. 282
  18. 227
  19. 894
  20. 49
  21. 643
  22. 169
  23. 179
  24. 781
  25. 348
  26. 132
  27. 233
  28. 816
  29. 991
  30. 137
  31. 247
  32. 889
  33. 146
  34. 865
  35. 974
  36. 227
  37. 491
  38. 985
  39. 595
  40. 81

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