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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 840 · 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.Take 35 and take away the sum of its digits. What do you get?
  2. 2.702? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.3?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?237 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.3?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.846? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 92 and take away the sum of its digits. What do you get?
  8. 8.823? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.280? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.6?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.3?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 53 and take away the sum of its digits. What do you get?
  13. 13.Take 42 and take away the sum of its digits. What do you get?
  14. 14.Take 94 and take away the sum of its digits. What do you get?
  15. 15.Take 33 and take away the sum of its digits. What do you get?
  16. 16.52?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.241? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.723? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.5?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 77 and take away the sum of its digits. What do you get?
  21. 21.?584 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.3?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.7?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.2?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.8?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 88 and take away the sum of its digits. What do you get?
  27. 27.7?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.7?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.555? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?852 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 95 and take away the sum of its digits. What do you get?
  32. 32.?096 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 90 and take away the sum of its digits. What do you get?
  34. 34.Take 27 and take away the sum of its digits. What do you get?
  35. 35.6?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.302? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.88?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?543 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.4?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 34 and take away the sum of its digits. What do you get?

Answer key

  1. 27
  2. 9
  3. 9
  4. 6
  5. 3
  6. 9
  7. 81
  8. 5
  9. 8
  10. 7
  11. 3
  12. 45
  13. 36
  14. 81
  15. 27
  16. 8
  17. 2
  18. 6
  19. 3
  20. 63
  21. 1
  22. 3
  23. 5
  24. 3
  25. 3
  26. 72
  27. 3
  28. 9
  29. 3
  30. 3
  31. 81
  32. 3
  33. 81
  34. 18
  35. 6
  36. 4
  37. 6
  38. 6
  39. 9
  40. 27

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