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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 770 · 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.?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.72?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.9?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 51 and take away the sum of its digits. What do you get?
  5. 5.496? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?674 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.894? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 54 and take away the sum of its digits. What do you get?
  10. 10.4?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 40 and take away the sum of its digits. What do you get?
  12. 12.6?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?272 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.4?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?388 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.1?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.3?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 44 and take away the sum of its digits. What do you get?
  20. 20.Take 57 and take away the sum of its digits. What do you get?
  21. 21.?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.4?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 35 and take away the sum of its digits. What do you get?
  24. 24.Take 99 and take away the sum of its digits. What do you get?
  25. 25.Take 89 and take away the sum of its digits. What do you get?
  26. 26.Take 28 and take away the sum of its digits. What do you get?
  27. 27.7?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 84 and take away the sum of its digits. What do you get?
  29. 29.40?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 32 and take away the sum of its digits. What do you get?
  31. 31.Take 18 and take away the sum of its digits. What do you get?
  32. 32.53?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.8?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.353? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 29 and take away the sum of its digits. What do you get?
  36. 36.5?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 87 and take away the sum of its digits. What do you get?
  38. 38.48?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 36 and take away the sum of its digits. What do you get?
  40. 40.Take 97 and take away the sum of its digits. What do you get?

Answer key

  1. 1
  2. 5
  3. 9
  4. 45
  5. 8
  6. 6
  7. 1
  8. 6
  9. 45
  10. 2
  11. 36
  12. 3
  13. 1
  14. 7
  15. 5
  16. 8
  17. 3
  18. 8
  19. 36
  20. 45
  21. 3
  22. 4
  23. 27
  24. 81
  25. 72
  26. 18
  27. 8
  28. 72
  29. 8
  30. 27
  31. 9
  32. 1
  33. 7
  34. 7
  35. 18
  36. 4
  37. 72
  38. 2
  39. 27
  40. 81

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