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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 950 · 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.?625 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.48? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?041 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?521 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 53 and take away the sum of its digits. What do you get?
  6. 6.Take 16 and take away the sum of its digits. What do you get?
  7. 7.80?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?519 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 73 and take away the sum of its digits. What do you get?
  10. 10.49?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?488 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 84 and take away the sum of its digits. What do you get?
  13. 13.Take 88 and take away the sum of its digits. What do you get?
  14. 14.83?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 38 and take away the sum of its digits. What do you get?
  16. 16.6?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 82 and take away the sum of its digits. What do you get?
  18. 18.Take 56 and take away the sum of its digits. What do you get?
  19. 19.430? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?942 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 33 and take away the sum of its digits. What do you get?
  22. 22.?169 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.260? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?886 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 49 and take away the sum of its digits. What do you get?
  27. 27.Take 92 and take away the sum of its digits. What do you get?
  28. 28.5?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 59 and take away the sum of its digits. What do you get?
  31. 31.Take 26 and take away the sum of its digits. What do you get?
  32. 32.?596 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.3?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?276 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?938 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.85?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 42 and take away the sum of its digits. What do you get?
  38. 38.Take 28 and take away the sum of its digits. What do you get?
  39. 39.?199 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 29 and take away the sum of its digits. What do you get?

Answer key

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

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