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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 946 · 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. 1.6?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.2?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.32?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 59 and take away the sum of its digits. What do you get?
  5. 5.Take 26 and take away the sum of its digits. What do you get?
  6. 6.Take 54 and take away the sum of its digits. What do you get?
  7. 7.837? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.73?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.86?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 65 and take away the sum of its digits. What do you get?
  11. 11.?517 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 88 and take away the sum of its digits. What do you get?
  13. 13.52?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 45 and take away the sum of its digits. What do you get?
  15. 15.Take 76 and take away the sum of its digits. What do you get?
  16. 16.4?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.4?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 62 and take away the sum of its digits. What do you get?
  19. 19.?606 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.430? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.55?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.377? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 89 and take away the sum of its digits. What do you get?
  24. 24.7?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 43 and take away the sum of its digits. What do you get?
  26. 26.Take 29 and take away the sum of its digits. What do you get?
  27. 27.89? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 36 and take away the sum of its digits. What do you get?
  29. 29.Take 47 and take away the sum of its digits. What do you get?
  30. 30.589? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.27? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 34 and take away the sum of its digits. What do you get?
  33. 33.?013 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 20 and take away the sum of its digits. What do you get?
  35. 35.Take 66 and take away the sum of its digits. What do you get?
  36. 36.204? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 94 and take away the sum of its digits. What do you get?
  38. 38.?600 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 44 and take away the sum of its digits. What do you get?
  40. 40.Take 85 and take away the sum of its digits. What do you get?

Answer key

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

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