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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 26 · 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. 1.288 − ? = 5
  2. 2.889 + 106 =
  3. 3.542 + 227 =
  4. 4.347 − ? = 61
  5. 5.753 − 168 =
  6. 6.? − 266 = 438
  7. 7.A school has 896 children. 513 of them are girls. How many boys are there?
  8. 8.A school has 430 children. 301 of them are girls. How many boys are there?
  9. 9.375 − ? = 236
  10. 10.A train has 446 people in the front coaches and 146 people in the back coaches. How many people are on the train?
  11. 11.151 + 101 =
  12. 12.A school has 956 children. 869 of them are girls. How many boys are there?
  13. 13.A school has 894 children. 262 of them are girls. How many boys are there?
  14. 14.159 + ? = 630
  15. 15.A school has 388 children. 201 of them are girls. How many boys are there?
  16. 16.A train has 898 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  17. 17.591 + ? = 904
  18. 18.929 − ? = 200
  19. 19.A school has 644 children. 306 of them are girls. How many boys are there?
  20. 20.A train has 828 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  21. 21.578 − 172 =
  22. 22.718 − 681 =
  23. 23.? + 533 = 892
  24. 24.? + 209 = 616
  25. 25.A train has 599 people in the front coaches and 210 people in the back coaches. How many people are on the train?
  26. 26.? − 838 = 106
  27. 27.A train has 866 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  28. 28.689 + 210 =
  29. 29.A train has 230 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  30. 30.285 − 171 =
  31. 31.? − 555 = 40
  32. 32.A train has 148 people in the front coaches and 518 people in the back coaches. How many people are on the train?
  33. 33.126 + 712 =
  34. 34.? + 897 = 999
  35. 35.A school has 707 children. 401 of them are girls. How many boys are there?
  36. 36.584 − 309 =
  37. 37.507 + 276 =
  38. 38.530 − ? = 378
  39. 39.A train has 867 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  40. 40.A train has 551 people in the front coaches and 165 people in the back coaches. How many people are on the train?

Answer key

  1. 283
  2. 995
  3. 769
  4. 286
  5. 585
  6. 704
  7. 383
  8. 129
  9. 139
  10. 592
  11. 252
  12. 87
  13. 632
  14. 471
  15. 187
  16. 998
  17. 313
  18. 729
  19. 338
  20. 942
  21. 406
  22. 37
  23. 359
  24. 407
  25. 809
  26. 944
  27. 997
  28. 899
  29. 630
  30. 114
  31. 595
  32. 666
  33. 838
  34. 102
  35. 306
  36. 275
  37. 783
  38. 152
  39. 968
  40. 716

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