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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 826 · 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. 1.4?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.591? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.5?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 71 and take away the sum of its digits. What do you get?
  5. 5.Take 94 and take away the sum of its digits. What do you get?
  6. 6.Take 88 and take away the sum of its digits. What do you get?
  7. 7.436? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.2?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 29 and take away the sum of its digits. What do you get?
  10. 10.?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.86? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.13?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.1?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.17?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 44 and take away the sum of its digits. What do you get?
  16. 16.5?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?364 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 67 and take away the sum of its digits. What do you get?
  19. 19.72?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.56?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 89 and take away the sum of its digits. What do you get?
  22. 22.57?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 96 and take away the sum of its digits. What do you get?
  24. 24.?227 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.1?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?056 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.3?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 65 and take away the sum of its digits. What do you get?
  29. 29.1?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 85 and take away the sum of its digits. What do you get?
  31. 31.6?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 24 and take away the sum of its digits. What do you get?
  33. 33.775? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.191? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 15 and take away the sum of its digits. What do you get?
  36. 36.?033 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 63 and take away the sum of its digits. What do you get?
  38. 38.?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 62 and take away the sum of its digits. What do you get?
  40. 40.Take 35 and take away the sum of its digits. What do you get?

Answer key

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

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