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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 308 · 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. 1.5?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  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.?087 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.697? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 13 and take away the sum of its digits. What do you get?
  6. 6.Take 48 and take away the sum of its digits. What do you get?
  7. 7.Take 29 and take away the sum of its digits. What do you get?
  8. 8.207? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 23 and take away the sum of its digits. What do you get?
  10. 10.Take 76 and take away the sum of its digits. What do you get?
  11. 11.Take 44 and take away the sum of its digits. What do you get?
  12. 12.?034 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.1?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?917 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 36 and take away the sum of its digits. What do you get?
  16. 16.11?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.91? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?935 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 60 and take away the sum of its digits. What do you get?
  20. 20.5?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?328 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?94 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. 24.6?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.1?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 32 and take away the sum of its digits. What do you get?
  27. 27.92? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 31 and take away the sum of its digits. What do you get?
  29. 29.?38 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.753? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?096 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 30 and take away the sum of its digits. What do you get?
  34. 34.3?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.8?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 73 and take away the sum of its digits. What do you get?
  37. 37.413? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.670? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?101 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 88 and take away the sum of its digits. What do you get?

Answer key

  1. 1
  2. 4
  3. 3
  4. 5
  5. 9
  6. 36
  7. 18
  8. 9
  9. 18
  10. 63
  11. 36
  12. 2
  13. 9
  14. 1
  15. 27
  16. 1
  17. 8
  18. 1
  19. 54
  20. 5
  21. 5
  22. 5
  23. 45
  24. 4
  25. 9
  26. 27
  27. 7
  28. 27
  29. 7
  30. 3
  31. 3
  32. 4
  33. 27
  34. 8
  35. 1
  36. 63
  37. 1
  38. 5
  39. 7
  40. 72

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