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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 177 · 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.?592 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?857 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 52 and take away the sum of its digits. What do you get?
  4. 4.Take 14 and take away the sum of its digits. What do you get?
  5. 5.Take 40 and take away the sum of its digits. What do you get?
  6. 6.?734 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 32 and take away the sum of its digits. What do you get?
  8. 8.?176 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 15 and take away the sum of its digits. What do you get?
  10. 10.Take 45 and take away the sum of its digits. What do you get?
  11. 11.5?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.9?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 80 and take away the sum of its digits. What do you get?
  14. 14.26?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 60 and take away the sum of its digits. What do you get?
  16. 16.4?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?627 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.73?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.6?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.79?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?341 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 63 and take away the sum of its digits. What do you get?
  24. 24.107? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?596 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 84 and take away the sum of its digits. What do you get?
  27. 27.4?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.3?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?007 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 48 and take away the sum of its digits. What do you get?
  31. 31.76?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 62 and take away the sum of its digits. What do you get?
  33. 33.?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.8?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.6?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.2?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.667? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.1?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.428? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?258 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. 7
  3. 45
  4. 9
  5. 36
  6. 4
  7. 27
  8. 4
  9. 9
  10. 36
  11. 3
  12. 2
  13. 72
  14. 6
  15. 54
  16. 6
  17. 3
  18. 3
  19. 3
  20. 9
  21. 8
  22. 1
  23. 54
  24. 1
  25. 7
  26. 72
  27. 5
  28. 7
  29. 2
  30. 36
  31. 8
  32. 54
  33. 3
  34. 8
  35. 5
  36. 6
  37. 8
  38. 6
  39. 4
  40. 3

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