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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 522 · 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.?276 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.693? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.22?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?623 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.96? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.167? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.1?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.5?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 93 and take away the sum of its digits. What do you get?
  11. 11.Take 22 and take away the sum of its digits. What do you get?
  12. 12.Take 28 and take away the sum of its digits. What do you get?
  13. 13.7?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?899 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.70? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.5?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 80 and take away the sum of its digits. What do you get?
  18. 18.Take 25 and take away the sum of its digits. What do you get?
  19. 19.Take 76 and take away the sum of its digits. What do you get?
  20. 20.?920 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 73 and take away the sum of its digits. What do you get?
  22. 22.42?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?863 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.72?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?006 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 87 and take away the sum of its digits. What do you get?
  27. 27.38? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?552 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 97 and take away the sum of its digits. What do you get?
  30. 30.3?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?659 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 82 and take away the sum of its digits. What do you get?
  34. 34.20?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?443 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?699 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 14 and take away the sum of its digits. What do you get?
  38. 38.24?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.4?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.6?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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