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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 588 · 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.?264 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.2?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 99 and take away the sum of its digits. What do you get?
  5. 5.196? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.5?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.18?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?682 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?608 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 93 and take away the sum of its digits. What do you get?
  12. 12.Take 31 and take away the sum of its digits. What do you get?
  13. 13.200? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.3?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.48?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.880? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?941 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.?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.25?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.19?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.6?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.10?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.37?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 76 and take away the sum of its digits. What do you get?
  26. 26.?615 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 63 and take away the sum of its digits. What do you get?
  28. 28.Take 54 and take away the sum of its digits. What do you get?
  29. 29.?401 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 23 and take away the sum of its digits. What do you get?
  31. 31.70?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 28 and take away the sum of its digits. What do you get?
  33. 33.3?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 27 and take away the sum of its digits. What do you get?
  35. 35.?499 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.6?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.108? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 26 and take away the sum of its digits. What do you get?
  39. 39.9?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.7?15 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. 7
  3. 8
  4. 81
  5. 2
  6. 7
  7. 7
  8. 9
  9. 2
  10. 4
  11. 81
  12. 27
  13. 7
  14. 8
  15. 8
  16. 2
  17. 4
  18. 54
  19. 2
  20. 4
  21. 8
  22. 2
  23. 1
  24. 6
  25. 63
  26. 6
  27. 54
  28. 45
  29. 4
  30. 18
  31. 8
  32. 18
  33. 1
  34. 18
  35. 5
  36. 3
  37. 9
  38. 18
  39. 8
  40. 5

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