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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 319 · 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 60 and take away the sum of its digits. What do you get?
  2. 2.2?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 34 and take away the sum of its digits. What do you get?
  4. 4.?050 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.5?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.2?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.68?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.871? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 96 and take away the sum of its digits. What do you get?
  10. 10.2?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 30 and take away the sum of its digits. What do you get?
  12. 12.68? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.34?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.6?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 45 and take away the sum of its digits. What do you get?
  16. 16.?706 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?028 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.20?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.781? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 95 and take away the sum of its digits. What do you get?
  21. 21.197? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.43?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.33?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.799? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.7?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?705 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.4?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.712? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 74 and take away the sum of its digits. What do you get?
  30. 30.?581 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.4?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.163? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 58 and take away the sum of its digits. What do you get?
  34. 34.?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.19? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.2?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 84 and take away the sum of its digits. What do you get?
  38. 38.8?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?083 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 39 and take away the sum of its digits. What do you get?

Answer key

  1. 54
  2. 6
  3. 27
  4. 4
  5. 5
  6. 8
  7. 3
  8. 2
  9. 81
  10. 4
  11. 27
  12. 4
  13. 4
  14. 8
  15. 36
  16. 5
  17. 8
  18. 7
  19. 2
  20. 81
  21. 1
  22. 9
  23. 4
  24. 2
  25. 4
  26. 6
  27. 9
  28. 8
  29. 63
  30. 4
  31. 6
  32. 8
  33. 45
  34. 2
  35. 8
  36. 6
  37. 72
  38. 1
  39. 7
  40. 27

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