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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 636 · 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 56 and take away the sum of its digits. What do you get?
  2. 2.65?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 15 and take away the sum of its digits. What do you get?
  4. 4.241? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?095 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?901 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.6?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 66 and take away the sum of its digits. What do you get?
  9. 9.59?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 39 and take away the sum of its digits. What do you get?
  11. 11.?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 45 and take away the sum of its digits. What do you get?
  13. 13.Take 64 and take away the sum of its digits. What do you get?
  14. 14.Take 37 and take away the sum of its digits. What do you get?
  15. 15.Take 54 and take away the sum of its digits. What do you get?
  16. 16.43?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?086 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.842? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.672? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?007 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.468? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?092 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 31 and take away the sum of its digits. What do you get?
  24. 24.Take 78 and take away the sum of its digits. What do you get?
  25. 25.33?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.184? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.7?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.4?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.54?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 88 and take away the sum of its digits. What do you get?
  31. 31.?191 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?143 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.607? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 84 and take away the sum of its digits. What do you get?
  35. 35.Take 57 and take away the sum of its digits. What do you get?
  36. 36.2?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?625 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.24?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.15?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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