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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 594 · 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.?051 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?305 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.250? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.6?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.6?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 66 and take away the sum of its digits. What do you get?
  7. 7.64?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?697 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.632? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.7?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.2?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 17 and take away the sum of its digits. What do you get?
  13. 13.5?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?997 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 29 and take away the sum of its digits. What do you get?
  16. 16.13?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 36 and take away the sum of its digits. What do you get?
  18. 18.665? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 12 and take away the sum of its digits. What do you get?
  20. 20.2?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.70?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 90 and take away the sum of its digits. What do you get?
  23. 23.69?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.3?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 85 and take away the sum of its digits. What do you get?
  26. 26.Take 40 and take away the sum of its digits. What do you get?
  27. 27.?547 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 98 and take away the sum of its digits. What do you get?
  29. 29.?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?449 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.5?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 13 and take away the sum of its digits. What do you get?
  33. 33.Take 86 and take away the sum of its digits. What do you get?
  34. 34.Take 26 and take away the sum of its digits. What do you get?
  35. 35.?491 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 39 and take away the sum of its digits. What do you get?
  37. 37.Take 35 and take away the sum of its digits. What do you get?
  38. 38.?026 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 51 and take away the sum of its digits. What do you get?
  40. 40.Take 16 and take away the sum of its digits. What do you get?

Answer key

  1. 3
  2. 1
  3. 2
  4. 6
  5. 7
  6. 54
  7. 1
  8. 5
  9. 7
  10. 2
  11. 3
  12. 9
  13. 3
  14. 2
  15. 18
  16. 3
  17. 27
  18. 1
  19. 9
  20. 4
  21. 2
  22. 81
  23. 7
  24. 1
  25. 72
  26. 36
  27. 2
  28. 81
  29. 9
  30. 1
  31. 5
  32. 9
  33. 72
  34. 18
  35. 4
  36. 27
  37. 27
  38. 1
  39. 45
  40. 9

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