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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 537 · 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. 1.8?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.538? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.4?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.7?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?007 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 72 and take away the sum of its digits. What do you get?
  7. 7.Take 14 and take away the sum of its digits. What do you get?
  8. 8.68?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 64 and take away the sum of its digits. What do you get?
  10. 10.?425 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 67 and take away the sum of its digits. What do you get?
  12. 12.3?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?165 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.75?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.61?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.32?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?645 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.566? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.524? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 96 and take away the sum of its digits. What do you get?
  21. 21.8?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?857 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?919 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 50 and take away the sum of its digits. What do you get?
  25. 25.?295 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 92 and take away the sum of its digits. What do you get?
  27. 27.Take 41 and take away the sum of its digits. What do you get?
  28. 28.690? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.357? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.74?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.166? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 19 and take away the sum of its digits. What do you get?
  33. 33.549? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 84 and take away the sum of its digits. What do you get?
  35. 35.68?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 49 and take away the sum of its digits. What do you get?
  37. 37.5?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.6?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 40 and take away the sum of its digits. What do you get?

Answer key

  1. 7
  2. 2
  3. 8
  4. 2
  5. 2
  6. 63
  7. 9
  8. 4
  9. 54
  10. 7
  11. 54
  12. 3
  13. 6
  14. 9
  15. 2
  16. 6
  17. 3
  18. 1
  19. 7
  20. 81
  21. 1
  22. 7
  23. 8
  24. 45
  25. 2
  26. 81
  27. 36
  28. 3
  29. 3
  30. 5
  31. 5
  32. 9
  33. 9
  34. 72
  35. 4
  36. 36
  37. 2
  38. 3
  39. 3
  40. 36

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