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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 784 · 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. 1.5?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.733? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 63 and take away the sum of its digits. What do you get?
  4. 4.Take 36 and take away the sum of its digits. What do you get?
  5. 5.Take 28 and take away the sum of its digits. What do you get?
  6. 6.Take 21 and take away the sum of its digits. What do you get?
  7. 7.20?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 41 and take away the sum of its digits. What do you get?
  9. 9.Take 73 and take away the sum of its digits. What do you get?
  10. 10.26?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?650 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 57 and take away the sum of its digits. What do you get?
  13. 13.Take 93 and take away the sum of its digits. What do you get?
  14. 14.?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.1?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?095 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.505? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.23?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.53?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 95 and take away the sum of its digits. What do you get?
  21. 21.44? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 62 and take away the sum of its digits. What do you get?
  23. 23.Take 23 and take away the sum of its digits. What do you get?
  24. 24.380? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 13 and take away the sum of its digits. What do you get?
  26. 26.?004 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?854 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.6?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.23?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 34 and take away the sum of its digits. What do you get?
  31. 31.Take 80 and take away the sum of its digits. What do you get?
  32. 32.4?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 99 and take away the sum of its digits. What do you get?
  34. 34.?295 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.43?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.672? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?420 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 30 and take away the sum of its digits. What do you get?
  39. 39.32?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.86?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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