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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 24 · 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. 1.64?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.72?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?037 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 64 and take away the sum of its digits. What do you get?
  6. 6.47?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 49 and take away the sum of its digits. What do you get?
  8. 8.Take 58 and take away the sum of its digits. What do you get?
  9. 9.545? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.2?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.447? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.337? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?102 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?308 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.4?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.608? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 95 and take away the sum of its digits. What do you get?
  18. 18.134? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?032 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.?091 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?150 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?834 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.78?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.677? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.497? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?059 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 71 and take away the sum of its digits. What do you get?
  30. 30.83?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.36?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?528 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 35 and take away the sum of its digits. What do you get?
  34. 34.1?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.414? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.416? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.2?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.14?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.302? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 30 and take away the sum of its digits. What do you get?

Answer key

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

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