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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 546 · 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. 1.7?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?357 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?280 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?699 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.2?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.3?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.411? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?026 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.234? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.32?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.322? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.4?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.52?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 47 and take away the sum of its digits. What do you get?
  15. 15.4?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?262 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 29 and take away the sum of its digits. What do you get?
  18. 18.Take 92 and take away the sum of its digits. What do you get?
  19. 19.Take 48 and take away the sum of its digits. What do you get?
  20. 20.8?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 76 and take away the sum of its digits. What do you get?
  22. 22.Take 86 and take away the sum of its digits. What do you get?
  23. 23.?978 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 58 and take away the sum of its digits. What do you get?
  25. 25.?830 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.13?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.73?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 35 and take away the sum of its digits. What do you get?
  30. 30.Take 60 and take away the sum of its digits. What do you get?
  31. 31.Take 59 and take away the sum of its digits. What do you get?
  32. 32.Take 93 and take away the sum of its digits. What do you get?
  33. 33.Take 99 and take away the sum of its digits. What do you get?
  34. 34.58? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 98 and take away the sum of its digits. What do you get?
  36. 36.Take 37 and take away the sum of its digits. What do you get?
  37. 37.746? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?316 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 63 and take away the sum of its digits. What do you get?

Answer key

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

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