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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 999 · 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. 1.4?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 98 and take away the sum of its digits. What do you get?
  3. 3.?965 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?748 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?953 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.40?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 33 and take away the sum of its digits. What do you get?
  8. 8.8?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?096 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.4?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 69 and take away the sum of its digits. What do you get?
  12. 12.?773 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?869 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 75 and take away the sum of its digits. What do you get?
  15. 15.?020 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 16 and take away the sum of its digits. What do you get?
  18. 18.Take 12 and take away the sum of its digits. What do you get?
  19. 19.538? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 30 and take away the sum of its digits. What do you get?
  21. 21.?147 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.835? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.66?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.76?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.9?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 31 and take away the sum of its digits. What do you get?
  27. 27.Take 15 and take away the sum of its digits. What do you get?
  28. 28.?393 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 66 and take away the sum of its digits. What do you get?
  30. 30.Take 43 and take away the sum of its digits. What do you get?
  31. 31.45?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 47 and take away the sum of its digits. What do you get?
  33. 33.Take 39 and take away the sum of its digits. What do you get?
  34. 34.Take 32 and take away the sum of its digits. What do you get?
  35. 35.?509 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 71 and take away the sum of its digits. What do you get?
  37. 37.?327 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?276 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.2?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.559? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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