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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 933 · 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 64 and take away the sum of its digits. What do you get?
  2. 2.50?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.4?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?911 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.321? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 49 and take away the sum of its digits. What do you get?
  7. 7.2?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.5?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.356? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.538? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.840? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 28 and take away the sum of its digits. What do you get?
  13. 13.5?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.8?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.7?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.16?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.44?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 17 and take away the sum of its digits. What do you get?
  19. 19.760? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.5?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 98 and take away the sum of its digits. What do you get?
  22. 22.129? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 59 and take away the sum of its digits. What do you get?
  24. 24.?730 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 81 and take away the sum of its digits. What do you get?
  26. 26.?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.6?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.7?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.81?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 94 and take away the sum of its digits. What do you get?
  31. 31.?502 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?421 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 63 and take away the sum of its digits. What do you get?
  34. 34.Take 84 and take away the sum of its digits. What do you get?
  35. 35.?228 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?051 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?134 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.133? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?083 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 54
  2. 4
  3. 9
  4. 7
  5. 3
  6. 36
  7. 2
  8. 8
  9. 4
  10. 2
  11. 6
  12. 18
  13. 4
  14. 5
  15. 1
  16. 5
  17. 1
  18. 9
  19. 5
  20. 6
  21. 81
  22. 6
  23. 45
  24. 8
  25. 72
  26. 7
  27. 8
  28. 1
  29. 3
  30. 81
  31. 2
  32. 2
  33. 54
  34. 72
  35. 6
  36. 3
  37. 1
  38. 2
  39. 9
  40. 7

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