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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 841 · 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 62 and take away the sum of its digits. What do you get?
  2. 2.Take 63 and take away the sum of its digits. What do you get?
  3. 3.?229 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.703? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.2?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?707 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?359 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?121 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 59 and take away the sum of its digits. What do you get?
  10. 10.?230 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.734? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 55 and take away the sum of its digits. What do you get?
  13. 13.81? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.63?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 92 and take away the sum of its digits. What do you get?
  16. 16.7?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?213 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.2?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 16 and take away the sum of its digits. What do you get?
  20. 20.Take 84 and take away the sum of its digits. What do you get?
  21. 21.?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 99 and take away the sum of its digits. What do you get?
  24. 24.?020 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.224? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 31 and take away the sum of its digits. What do you get?
  27. 27.Take 53 and take away the sum of its digits. What do you get?
  28. 28.58?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?976 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 40 and take away the sum of its digits. What do you get?
  31. 31.Take 56 and take away the sum of its digits. What do you get?
  32. 32.?851 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.6?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?716 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.7?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.5?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.1?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.30?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.105? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 15 and take away the sum of its digits. What do you get?

Answer key

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

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