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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 959 · 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.Take 58 and take away the sum of its digits. What do you get?
  2. 2.?051 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?402 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 14 and take away the sum of its digits. What do you get?
  5. 5.431? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.704? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.229? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 13 and take away the sum of its digits. What do you get?
  9. 9.?367 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?141 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 84 and take away the sum of its digits. What do you get?
  12. 12.4?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.7?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.18? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.8?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.89?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.4?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?068 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.83?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.5?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 69 and take away the sum of its digits. What do you get?
  22. 22.Take 51 and take away the sum of its digits. What do you get?
  23. 23.Take 80 and take away the sum of its digits. What do you get?
  24. 24.80?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.76?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?134 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 19 and take away the sum of its digits. What do you get?
  29. 29.76?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?933 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 24 and take away the sum of its digits. What do you get?
  32. 32.1?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.10?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 81 and take away the sum of its digits. What do you get?
  35. 35.23?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 16 and take away the sum of its digits. What do you get?
  37. 37.35?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 87 and take away the sum of its digits. What do you get?
  39. 39.66?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.87?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 45
  2. 3
  3. 3
  4. 9
  5. 1
  6. 7
  7. 5
  8. 9
  9. 2
  10. 3
  11. 72
  12. 7
  13. 7
  14. 9
  15. 3
  16. 1
  17. 8
  18. 4
  19. 8
  20. 5
  21. 54
  22. 45
  23. 72
  24. 1
  25. 5
  26. 5
  27. 1
  28. 9
  29. 5
  30. 3
  31. 18
  32. 2
  33. 5
  34. 72
  35. 9
  36. 9
  37. 8
  38. 72
  39. 9
  40. 6

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