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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 658 · 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. 1.367? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.58?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.679? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 31 and take away the sum of its digits. What do you get?
  5. 5.Take 43 and take away the sum of its digits. What do you get?
  6. 6.?571 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 60 and take away the sum of its digits. What do you get?
  8. 8.Take 20 and take away the sum of its digits. What do you get?
  9. 9.851? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 48 and take away the sum of its digits. What do you get?
  11. 11.845? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 22 and take away the sum of its digits. What do you get?
  13. 13.35?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?406 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.3?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.5?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 28 and take away the sum of its digits. What do you get?
  18. 18.6?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 57 and take away the sum of its digits. What do you get?
  21. 21.?300 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 67 and take away the sum of its digits. What do you get?
  24. 24.Take 93 and take away the sum of its digits. What do you get?
  25. 25.Take 36 and take away the sum of its digits. What do you get?
  26. 26.?602 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.163? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 39 and take away the sum of its digits. What do you get?
  29. 29.Take 49 and take away the sum of its digits. What do you get?
  30. 30.124? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 52 and take away the sum of its digits. What do you get?
  32. 32.516? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 75 and take away the sum of its digits. What do you get?
  34. 34.Take 82 and take away the sum of its digits. What do you get?
  35. 35.704? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 27 and take away the sum of its digits. What do you get?
  37. 37.Take 87 and take away the sum of its digits. What do you get?
  38. 38.8?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 84 and take away the sum of its digits. What do you get?
  40. 40.44?1 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. 9
  3. 5
  4. 27
  5. 36
  6. 5
  7. 54
  8. 18
  9. 4
  10. 36
  11. 1
  12. 18
  13. 9
  14. 8
  15. 1
  16. 2
  17. 18
  18. 4
  19. 8
  20. 45
  21. 6
  22. 6
  23. 54
  24. 81
  25. 27
  26. 1
  27. 8
  28. 27
  29. 36
  30. 2
  31. 45
  32. 6
  33. 63
  34. 72
  35. 7
  36. 18
  37. 72
  38. 1
  39. 72
  40. 9

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