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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 882 · 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.?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.444? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.22?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.243? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 28 and take away the sum of its digits. What do you get?
  6. 6.?967 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?287 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.398? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.3?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.3?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.349? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.69?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 60 and take away the sum of its digits. What do you get?
  15. 15.4?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 37 and take away the sum of its digits. What do you get?
  17. 17.?583 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.7?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?368 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 77 and take away the sum of its digits. What do you get?
  21. 21.?830 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 19 and take away the sum of its digits. What do you get?
  23. 23.Take 16 and take away the sum of its digits. What do you get?
  24. 24.3?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.8?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?490 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.26?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?544 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.1?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.1?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.34?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.34?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 18 and take away the sum of its digits. What do you get?
  34. 34.41?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.73?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 43 and take away the sum of its digits. What do you get?
  37. 37.Take 14 and take away the sum of its digits. What do you get?
  38. 38.52?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?448 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 57 and take away the sum of its digits. What do you get?

Answer key

  1. 8
  2. 6
  3. 1
  4. 9
  5. 18
  6. 5
  7. 1
  8. 7
  9. 6
  10. 5
  11. 9
  12. 2
  13. 1
  14. 54
  15. 3
  16. 27
  17. 2
  18. 3
  19. 1
  20. 63
  21. 7
  22. 9
  23. 9
  24. 4
  25. 5
  26. 5
  27. 8
  28. 5
  29. 8
  30. 4
  31. 8
  32. 9
  33. 9
  34. 6
  35. 8
  36. 36
  37. 9
  38. 2
  39. 2
  40. 45

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