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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 976 · 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. 1.2?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 13 and take away the sum of its digits. What do you get?
  3. 3.Take 64 and take away the sum of its digits. What do you get?
  4. 4.2?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 63 and take away the sum of its digits. What do you get?
  6. 6.688? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.62?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.64?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 41 and take away the sum of its digits. What do you get?
  10. 10.Take 17 and take away the sum of its digits. What do you get?
  11. 11.606? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?150 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.167? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.3?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.8?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.40?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 76 and take away the sum of its digits. What do you get?
  18. 18.Take 67 and take away the sum of its digits. What do you get?
  19. 19.7?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.363? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.5?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?802 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 94 and take away the sum of its digits. What do you get?
  24. 24.Take 58 and take away the sum of its digits. What do you get?
  25. 25.Take 79 and take away the sum of its digits. What do you get?
  26. 26.15?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.27?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.730? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.3?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.8?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.53?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 33 and take away the sum of its digits. What do you get?
  33. 33.1?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.578? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.6?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?259 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?925 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.6?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?035 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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