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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 868 · 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. 1.664? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 26 and take away the sum of its digits. What do you get?
  3. 3.59?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 88 and take away the sum of its digits. What do you get?
  5. 5.304? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 14 and take away the sum of its digits. What do you get?
  7. 7.Take 65 and take away the sum of its digits. What do you get?
  8. 8.?595 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.78?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 34 and take away the sum of its digits. What do you get?
  12. 12.Take 54 and take away the sum of its digits. What do you get?
  13. 13.210? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.1?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?400 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 70 and take away the sum of its digits. What do you get?
  18. 18.Take 53 and take away the sum of its digits. What do you get?
  19. 19.827? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.611? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.21?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.1?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?690 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.40?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.121? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 97 and take away the sum of its digits. What do you get?
  28. 28.30?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 23 and take away the sum of its digits. What do you get?
  30. 30.58?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.71?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?092 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.6?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.640? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.81?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.59?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 60 and take away the sum of its digits. What do you get?

Answer key

  1. 2
  2. 18
  3. 2
  4. 72
  5. 2
  6. 9
  7. 54
  8. 8
  9. 1
  10. 5
  11. 27
  12. 45
  13. 6
  14. 4
  15. 5
  16. 5
  17. 63
  18. 45
  19. 1
  20. 1
  21. 3
  22. 9
  23. 3
  24. 3
  25. 1
  26. 5
  27. 81
  28. 4
  29. 18
  30. 6
  31. 9
  32. 7
  33. 9
  34. 8
  35. 6
  36. 1
  37. 9
  38. 2
  39. 1
  40. 54

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