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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 583 · 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. 1.283? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.7?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 34 and take away the sum of its digits. What do you get?
  4. 4.?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 18 and take away the sum of its digits. What do you get?
  6. 6.Take 83 and take away the sum of its digits. What do you get?
  7. 7.?239 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?001 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?201 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 89 and take away the sum of its digits. What do you get?
  11. 11.Take 65 and take away the sum of its digits. What do you get?
  12. 12.856? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.48?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 98 and take away the sum of its digits. What do you get?
  15. 15.Take 74 and take away the sum of its digits. What do you get?
  16. 16.512? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 63 and take away the sum of its digits. What do you get?
  18. 18.Take 48 and take away the sum of its digits. What do you get?
  19. 19.6?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.701? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.8?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.56?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?474 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?264 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 19 and take away the sum of its digits. What do you get?
  26. 26.Take 11 and take away the sum of its digits. What do you get?
  27. 27.?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?673 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 70 and take away the sum of its digits. What do you get?
  30. 30.?420 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.8?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?071 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.138? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?764 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.1?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.61?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.49?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 51 and take away the sum of its digits. What do you get?
  40. 40.6?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 5
  2. 9
  3. 27
  4. 3
  5. 9
  6. 72
  7. 4
  8. 8
  9. 6
  10. 72
  11. 54
  12. 8
  13. 6
  14. 81
  15. 63
  16. 1
  17. 54
  18. 36
  19. 3
  20. 1
  21. 1
  22. 6
  23. 3
  24. 6
  25. 9
  26. 9
  27. 1
  28. 2
  29. 63
  30. 3
  31. 1
  32. 1
  33. 8
  34. 6
  35. 1
  36. 8
  37. 8
  38. 5
  39. 45
  40. 7

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