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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 137 · 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. 1.6?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.4?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 14 and take away the sum of its digits. What do you get?
  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.Take 59 and take away the sum of its digits. What do you get?
  6. 6.Take 49 and take away the sum of its digits. What do you get?
  7. 7.Take 16 and take away the sum of its digits. What do you get?
  8. 8.Take 18 and take away the sum of its digits. What do you get?
  9. 9.?848 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.731? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.1?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.65?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 17 and take away the sum of its digits. What do you get?
  14. 14.46?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.54?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.334? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.2?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 13 and take away the sum of its digits. What do you get?
  19. 19.61?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 68 and take away the sum of its digits. What do you get?
  22. 22.Take 26 and take away the sum of its digits. What do you get?
  23. 23.2?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 74 and take away the sum of its digits. What do you get?
  25. 25.79?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.64?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.59?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?113 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 35 and take away the sum of its digits. What do you get?
  30. 30.8?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?814 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.4?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?988 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.591? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.833? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.9?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.4?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.78?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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