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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 896 · 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?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.6?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.3?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.7?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.662? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 50 and take away the sum of its digits. What do you get?
  7. 7.41?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.8?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?832 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 95 and take away the sum of its digits. What do you get?
  11. 11.71?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?995 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 19 and take away the sum of its digits. What do you get?
  14. 14.103? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.12?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.7?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 33 and take away the sum of its digits. What do you get?
  19. 19.Take 97 and take away the sum of its digits. What do you get?
  20. 20.?709 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.33?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?488 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.8?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 23 and take away the sum of its digits. What do you get?
  25. 25.?386 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 35 and take away the sum of its digits. What do you get?
  27. 27.Take 77 and take away the sum of its digits. What do you get?
  28. 28.?818 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.51?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 21 and take away the sum of its digits. What do you get?
  31. 31.Take 82 and take away the sum of its digits. What do you get?
  32. 32.567? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.361? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?510 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.2?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?651 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?529 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.40?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 98 and take away the sum of its digits. What do you get?
  40. 40.Take 25 and take away the sum of its digits. What do you get?

Answer key

  1. 4
  2. 1
  3. 1
  4. 2
  5. 4
  6. 45
  7. 8
  8. 9
  9. 5
  10. 81
  11. 4
  12. 4
  13. 9
  14. 5
  15. 6
  16. 1
  17. 5
  18. 27
  19. 81
  20. 2
  21. 1
  22. 7
  23. 6
  24. 18
  25. 1
  26. 27
  27. 63
  28. 1
  29. 8
  30. 18
  31. 72
  32. 9
  33. 8
  34. 3
  35. 4
  36. 6
  37. 2
  38. 1
  39. 81
  40. 18

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