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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 133 · 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?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.764? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 59 and take away the sum of its digits. What do you get?
  4. 4.540? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?851 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.50?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?341 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.756? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.535? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?887 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 23 and take away the sum of its digits. What do you get?
  12. 12.?229 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 27 and take away the sum of its digits. What do you get?
  14. 14.6?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 94 and take away the sum of its digits. What do you get?
  16. 16.?422 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.13?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 86 and take away the sum of its digits. What do you get?
  19. 19.507? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 26 and take away the sum of its digits. What do you get?
  21. 21.?174 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.15?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 90 and take away the sum of its digits. What do you get?
  24. 24.20?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.30?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.428? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?926 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?335 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?264 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 81 and take away the sum of its digits. What do you get?
  31. 31.529? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 72 and take away the sum of its digits. What do you get?
  33. 33.Take 57 and take away the sum of its digits. What do you get?
  34. 34.543? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 56 and take away the sum of its digits. What do you get?
  36. 36.?001 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.17?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?960 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.2?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 35 and take away the sum of its digits. What do you get?

Answer key

  1. 9
  2. 1
  3. 45
  4. 9
  5. 4
  6. 5
  7. 1
  8. 9
  9. 5
  10. 4
  11. 18
  12. 5
  13. 18
  14. 7
  15. 81
  16. 1
  17. 5
  18. 72
  19. 6
  20. 18
  21. 6
  22. 6
  23. 81
  24. 1
  25. 8
  26. 4
  27. 1
  28. 7
  29. 6
  30. 72
  31. 2
  32. 63
  33. 45
  34. 6
  35. 45
  36. 8
  37. 1
  38. 3
  39. 8
  40. 27

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