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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 570 · 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. 1.2?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.58?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 31 and take away the sum of its digits. What do you get?
  4. 4.218? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.82?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.15?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?123 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.2?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 16 and take away the sum of its digits. What do you get?
  10. 10.2?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 29 and take away the sum of its digits. What do you get?
  12. 12.Take 23 and take away the sum of its digits. What do you get?
  13. 13.7?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 25 and take away the sum of its digits. What do you get?
  15. 15.18? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 96 and take away the sum of its digits. What do you get?
  17. 17.Take 62 and take away the sum of its digits. What do you get?
  18. 18.1?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?615 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?002 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 36 and take away the sum of its digits. What do you get?
  22. 22.?600 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 34 and take away the sum of its digits. What do you get?
  24. 24.Take 46 and take away the sum of its digits. What do you get?
  25. 25.?415 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 90 and take away the sum of its digits. What do you get?
  27. 27.8?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 54 and take away the sum of its digits. What do you get?
  29. 29.Take 68 and take away the sum of its digits. What do you get?
  30. 30.Take 89 and take away the sum of its digits. What do you get?
  31. 31.1?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 49 and take away the sum of its digits. What do you get?
  33. 33.?325 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.5?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?452 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.46?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?840 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 41 and take away the sum of its digits. What do you get?
  39. 39.88?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 27 and take away the sum of its digits. What do you get?

Answer key

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

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