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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 927 · 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.?245 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.12?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.210? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?230 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.51? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 99 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. 8.26?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 22 and take away the sum of its digits. What do you get?
  10. 10.65?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?016 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.6?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 13 and take away the sum of its digits. What do you get?
  14. 14.Take 63 and take away the sum of its digits. What do you get?
  15. 15.Take 17 and take away the sum of its digits. What do you get?
  16. 16.72?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.6?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.322? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 95 and take away the sum of its digits. What do you get?
  20. 20.1?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 44 and take away the sum of its digits. What do you get?
  23. 23.Take 45 and take away the sum of its digits. What do you get?
  24. 24.6?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?218 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 33 and take away the sum of its digits. What do you get?
  27. 27.Take 39 and take away the sum of its digits. What do you get?
  28. 28.?025 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.34?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.540? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.1?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?043 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?760 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.6?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 35 and take away the sum of its digits. What do you get?
  36. 36.?384 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.63?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 34 and take away the sum of its digits. What do you get?
  39. 39.86?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 88 and take away the sum of its digits. What do you get?

Answer key

  1. 7
  2. 2
  3. 6
  4. 4
  5. 3
  6. 81
  7. 9
  8. 2
  9. 18
  10. 5
  11. 2
  12. 3
  13. 9
  14. 54
  15. 9
  16. 9
  17. 4
  18. 2
  19. 81
  20. 2
  21. 8
  22. 36
  23. 36
  24. 3
  25. 7
  26. 27
  27. 27
  28. 2
  29. 5
  30. 9
  31. 9
  32. 2
  33. 5
  34. 3
  35. 27
  36. 3
  37. 5
  38. 27
  39. 4
  40. 72

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