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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 405 · 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 94 and take away the sum of its digits. What do you get?
  2. 2.?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.2?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.63?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?883 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.64?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?713 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 13 and take away the sum of its digits. What do you get?
  10. 10.?588 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 97 and take away the sum of its digits. What do you get?
  12. 12.5?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?795 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 50 and take away the sum of its digits. What do you get?
  15. 15.668? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 30 and take away the sum of its digits. What do you get?
  17. 17.35?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 66 and take away the sum of its digits. What do you get?
  19. 19.3?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?443 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. 22.24? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.37?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.46?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?276 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?258 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.3?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.18?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.84? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.400? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.502? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 36 and take away the sum of its digits. What do you get?
  33. 33.Take 23 and take away the sum of its digits. What do you get?
  34. 34.71? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.6?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 49 and take away the sum of its digits. What do you get?
  37. 37.?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.24?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 57 and take away the sum of its digits. What do you get?
  40. 40.24?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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