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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 629 · 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. 1.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.41?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 11 and take away the sum of its digits. What do you get?
  4. 4.Take 68 and take away the sum of its digits. What do you get?
  5. 5.?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.29?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.97? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 45 and take away the sum of its digits. What do you get?
  9. 9.?579 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.?226 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.1?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 36 and take away the sum of its digits. What do you get?
  14. 14.?687 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.6?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.9?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 51 and take away the sum of its digits. What do you get?
  18. 18.?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.230? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.8?82 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.8?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.5?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.4?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?130 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 69 and take away the sum of its digits. What do you get?
  27. 27.Take 63 and take away the sum of its digits. What do you get?
  28. 28.Take 81 and take away the sum of its digits. What do you get?
  29. 29.?977 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.1?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.537? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.5?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.1?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 35 and take away the sum of its digits. What do you get?
  35. 35.Take 53 and take away the sum of its digits. What do you get?
  36. 36.Take 98 and take away the sum of its digits. What do you get?
  37. 37.181? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?663 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.6?38 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?392 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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