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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 381 · 40 questions
TalentJR

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

NameDateTime takenScore ___ / 40
  1. 1.3?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 16 and take away the sum of its digits. What do you get?
  3. 3.?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 26 and take away the sum of its digits. What do you get?
  5. 5.Take 39 and take away the sum of its digits. What do you get?
  6. 6.?418 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.6?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.4?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 89 and take away the sum of its digits. What do you get?
  10. 10.2?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.5?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?464 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?803 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 46 and take away the sum of its digits. What do you get?
  15. 15.?672 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.43?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.75?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 64 and take away the sum of its digits. What do you get?
  20. 20.2?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.7?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.13?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 47 and take away the sum of its digits. What do you get?
  24. 24.7?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 11 and take away the sum of its digits. What do you get?
  26. 26.15?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.579? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 27 and take away the sum of its digits. What do you get?
  29. 29.12?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.138? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 28 and take away the sum of its digits. What do you get?
  33. 33.1?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.47?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 63 and take away the sum of its digits. What do you get?
  36. 36.333? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.3?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.9?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 96 and take away the sum of its digits. What do you get?
  40. 40.Take 19 and take away the sum of its digits. What do you get?

Answer key

  1. 7
  2. 9
  3. 8
  4. 18
  5. 27
  6. 5
  7. 1
  8. 5
  9. 72
  10. 5
  11. 8
  12. 4
  13. 7
  14. 36
  15. 3
  16. 3
  17. 3
  18. 6
  19. 54
  20. 2
  21. 5
  22. 1
  23. 36
  24. 3
  25. 9
  26. 3
  27. 6
  28. 18
  29. 5
  30. 8
  31. 6
  32. 18
  33. 2
  34. 4
  35. 54
  36. 9
  37. 4
  38. 5
  39. 81
  40. 9

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