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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 974 · 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 56 and take away the sum of its digits. What do you get?
  2. 2.Take 72 and take away the sum of its digits. What do you get?
  3. 3.885? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 88 and take away the sum of its digits. What do you get?
  5. 5.?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.551? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 53 and take away the sum of its digits. What do you get?
  8. 8.7?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.44? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.20?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?245 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 45 and take away the sum of its digits. What do you get?
  13. 13.34?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?691 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.5?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?413 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.2?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.26?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.780? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 44 and take away the sum of its digits. What do you get?
  24. 24.67? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 82 and take away the sum of its digits. What do you get?
  26. 26.764? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.27?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 39 and take away the sum of its digits. What do you get?
  29. 29.84?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 17 and take away the sum of its digits. What do you get?
  31. 31.65?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 11 and take away the sum of its digits. What do you get?
  33. 33.?407 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.351? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.32?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.408? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.45?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 52 and take away the sum of its digits. What do you get?
  39. 39.229? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.3?02 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. 63
  3. 6
  4. 72
  5. 8
  6. 7
  7. 45
  8. 4
  9. 1
  10. 9
  11. 7
  12. 36
  13. 3
  14. 2
  15. 9
  16. 1
  17. 7
  18. 9
  19. 7
  20. 3
  21. 7
  22. 7
  23. 36
  24. 5
  25. 72
  26. 1
  27. 9
  28. 27
  29. 1
  30. 9
  31. 4
  32. 9
  33. 7
  34. 9
  35. 4
  36. 6
  37. 9
  38. 45
  39. 5
  40. 4

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