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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 61 · 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 43 and take away the sum of its digits. What do you get?
  2. 2.?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 82 and take away the sum of its digits. What do you get?
  4. 4.Take 95 and take away the sum of its digits. What do you get?
  5. 5.23?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 87 and take away the sum of its digits. What do you get?
  7. 7.10?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.16?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.277? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 23 and take away the sum of its digits. What do you get?
  11. 11.Take 94 and take away the sum of its digits. What do you get?
  12. 12.660? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 26 and take away the sum of its digits. What do you get?
  14. 14.?305 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.422? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?788 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 85 and take away the sum of its digits. What do you get?
  19. 19.Take 22 and take away the sum of its digits. What do you get?
  20. 20.2?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?604 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.2?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 76 and take away the sum of its digits. What do you get?
  24. 24.26?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 12 and take away the sum of its digits. What do you get?
  26. 26.Take 64 and take away the sum of its digits. What do you get?
  27. 27.Take 81 and take away the sum of its digits. What do you get?
  28. 28.?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.325? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.3?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.5?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.461? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.10?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.53?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 70 and take away the sum of its digits. What do you get?
  36. 36.?922 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.54? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 42 and take away the sum of its digits. What do you get?
  39. 39.?935 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 89 and take away the sum of its digits. What do you get?

Answer key

  1. 36
  2. 1
  3. 72
  4. 81
  5. 6
  6. 72
  7. 6
  8. 8
  9. 2
  10. 18
  11. 81
  12. 6
  13. 18
  14. 1
  15. 7
  16. 1
  17. 4
  18. 72
  19. 18
  20. 9
  21. 8
  22. 7
  23. 63
  24. 2
  25. 9
  26. 54
  27. 72
  28. 2
  29. 8
  30. 6
  31. 4
  32. 7
  33. 8
  34. 1
  35. 63
  36. 5
  37. 9
  38. 36
  39. 1
  40. 72

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