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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 789 · 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. 1.62?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?352 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 44 and take away the sum of its digits. What do you get?
  4. 4.873? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.6?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.27?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 40 and take away the sum of its digits. What do you get?
  8. 8.Take 66 and take away the sum of its digits. What do you get?
  9. 9.Take 72 and take away the sum of its digits. What do you get?
  10. 10.399? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.56? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.1?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?328 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.31? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?082 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.5?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 62 and take away the sum of its digits. What do you get?
  20. 20.Take 41 and take away the sum of its digits. What do you get?
  21. 21.?852 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 23 and take away the sum of its digits. What do you get?
  23. 23.Take 93 and take away the sum of its digits. What do you get?
  24. 24.Take 53 and take away the sum of its digits. What do you get?
  25. 25.Take 17 and take away the sum of its digits. What do you get?
  26. 26.?197 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.8?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.197? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 48 and take away the sum of its digits. What do you get?
  30. 30.705? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.1?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.352? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 87 and take away the sum of its digits. What do you get?
  34. 34.23?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?767 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?052 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 79 and take away the sum of its digits. What do you get?
  38. 38.?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.2?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.500? 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. 8
  3. 36
  4. 9
  5. 2
  6. 9
  7. 36
  8. 54
  9. 63
  10. 6
  11. 1
  12. 7
  13. 8
  14. 5
  15. 5
  16. 8
  17. 3
  18. 4
  19. 54
  20. 36
  21. 3
  22. 18
  23. 81
  24. 45
  25. 9
  26. 1
  27. 3
  28. 1
  29. 36
  30. 6
  31. 1
  32. 8
  33. 72
  34. 4
  35. 7
  36. 2
  37. 63
  38. 7
  39. 7
  40. 4

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