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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 425 · 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. 1.4?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.9?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?989 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.311? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?260 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.480? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?832 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 72 and take away the sum of its digits. What do you get?
  9. 9.?264 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.7?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?205 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.8?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?910 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.669? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 83 and take away the sum of its digits. What do you get?
  16. 16.23?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?742 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 35 and take away the sum of its digits. What do you get?
  20. 20.Take 21 and take away the sum of its digits. What do you get?
  21. 21.Take 48 and take away the sum of its digits. What do you get?
  22. 22.49?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?343 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 22 and take away the sum of its digits. What do you get?
  25. 25.?316 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 71 and take away the sum of its digits. What do you get?
  27. 27.865? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?672 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 68 and take away the sum of its digits. What do you get?
  30. 30.5?82 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?869 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 93 and take away the sum of its digits. What do you get?
  33. 33.?418 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.286? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 27 and take away the sum of its digits. What do you get?
  36. 36.?599 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?979 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.560? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.723? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 62 and take away the sum of its digits. What do you get?

Answer key

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

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