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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 605 · 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. 1.19?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 71 and take away the sum of its digits. What do you get?
  3. 3.52? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.6?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.34?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 15 and take away the sum of its digits. What do you get?
  8. 8.Take 13 and take away the sum of its digits. What do you get?
  9. 9.?724 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.4?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 27 and take away the sum of its digits. What do you get?
  12. 12.?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?530 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.23?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 60 and take away the sum of its digits. What do you get?
  17. 17.6?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.5?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?985 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 76 and take away the sum of its digits. What do you get?
  21. 21.4?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?363 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 68 and take away the sum of its digits. What do you get?
  24. 24.Take 95 and take away the sum of its digits. What do you get?
  25. 25.Take 78 and take away the sum of its digits. What do you get?
  26. 26.47?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 33 and take away the sum of its digits. What do you get?
  28. 28.508? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.68?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.4?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 22 and take away the sum of its digits. What do you get?
  33. 33.1?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.60?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?566 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 73 and take away the sum of its digits. What do you get?
  37. 37.206? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.2?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.211? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.8?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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