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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 245 · 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.?300 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 60 and take away the sum of its digits. What do you get?
  3. 3.Take 82 and take away the sum of its digits. What do you get?
  4. 4.Take 41 and take away the sum of its digits. What do you get?
  5. 5.400? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?460 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.1?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 23 and take away the sum of its digits. What do you get?
  9. 9.378? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 36 and take away the sum of its digits. What do you get?
  11. 11.14?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.859? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.27?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?408 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 68 and take away the sum of its digits. What do you get?
  16. 16.3?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 58 and take away the sum of its digits. What do you get?
  18. 18.614? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.43?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.75?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 48 and take away the sum of its digits. What do you get?
  22. 22.62?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 17 and take away the sum of its digits. What do you get?
  24. 24.?080 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.43?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.652? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.8?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?525 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?172 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.406? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.176? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.11?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.113? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?920 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.204? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.5?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 32 and take away the sum of its digits. What do you get?
  38. 38.60?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 28 and take away the sum of its digits. What do you get?
  40. 40.86?4 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. 54
  3. 72
  4. 36
  5. 5
  6. 8
  7. 2
  8. 18
  9. 9
  10. 27
  11. 1
  12. 5
  13. 7
  14. 6
  15. 54
  16. 7
  17. 45
  18. 7
  19. 2
  20. 8
  21. 36
  22. 6
  23. 9
  24. 1
  25. 7
  26. 5
  27. 5
  28. 6
  29. 8
  30. 8
  31. 4
  32. 6
  33. 4
  34. 7
  35. 3
  36. 4
  37. 27
  38. 8
  39. 18
  40. 9

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