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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 872 · 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 59 and take away the sum of its digits. What do you get?
  2. 2.?233 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 35 and take away the sum of its digits. What do you get?
  4. 4.Take 53 and take away the sum of its digits. What do you get?
  5. 5.36?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?560 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?527 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.29?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 29 and take away the sum of its digits. What do you get?
  10. 10.?382 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?606 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.5?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 52 and take away the sum of its digits. What do you get?
  14. 14.211? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.603? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.3?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 81 and take away the sum of its digits. What do you get?
  18. 18.8?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.23?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.13?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.41?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.49?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.55?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 67 and take away the sum of its digits. What do you get?
  27. 27.7?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 61 and take away the sum of its digits. What do you get?
  29. 29.67?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 92 and take away the sum of its digits. What do you get?
  31. 31.8?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.74?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 98 and take away the sum of its digits. What do you get?
  34. 34.Take 79 and take away the sum of its digits. What do you get?
  35. 35.1?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.60?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 48 and take away the sum of its digits. What do you get?
  38. 38.?390 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 38 and take away the sum of its digits. What do you get?
  40. 40.79?8 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. 1
  3. 27
  4. 45
  5. 7
  6. 7
  7. 4
  8. 6
  9. 18
  10. 5
  11. 6
  12. 1
  13. 45
  14. 5
  15. 9
  16. 6
  17. 72
  18. 4
  19. 4
  20. 4
  21. 4
  22. 7
  23. 6
  24. 1
  25. 7
  26. 54
  27. 1
  28. 54
  29. 4
  30. 81
  31. 3
  32. 2
  33. 81
  34. 63
  35. 9
  36. 3
  37. 36
  38. 6
  39. 27
  40. 3

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