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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 782 · 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. 1.7?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.56? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 15 and take away the sum of its digits. What do you get?
  4. 4.5?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 41 and take away the sum of its digits. What do you get?
  6. 6.Take 37 and take away the sum of its digits. What do you get?
  7. 7.Take 71 and take away the sum of its digits. What do you get?
  8. 8.Take 12 and take away the sum of its digits. What do you get?
  9. 9.540? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 60 and take away the sum of its digits. What do you get?
  11. 11.?771 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 74 and take away the sum of its digits. What do you get?
  13. 13.61?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?335 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.255? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.60?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 47 and take away the sum of its digits. What do you get?
  18. 18.Take 26 and take away the sum of its digits. What do you get?
  19. 19.12?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 18 and take away the sum of its digits. What do you get?
  21. 21.18?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?268 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?053 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 99 and take away the sum of its digits. What do you get?
  25. 25.8?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 58 and take away the sum of its digits. What do you get?
  28. 28.?247 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.681? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?643 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.106? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.7?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.90? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 94 and take away the sum of its digits. What do you get?
  35. 35.8?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.2?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.741? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.275? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.5?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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