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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 227 · 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. 1.11?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 35 and take away the sum of its digits. What do you get?
  3. 3.21?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.60?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 94 and take away the sum of its digits. What do you get?
  6. 6.18?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 14 and take away the sum of its digits. What do you get?
  8. 8.88?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.810? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?971 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 32 and take away the sum of its digits. What do you get?
  12. 12.?262 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 20 and take away the sum of its digits. What do you get?
  14. 14.38?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.70?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.14?2 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.?820 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 19 and take away the sum of its digits. What do you get?
  20. 20.17?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.7?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 88 and take away the sum of its digits. What do you get?
  24. 24.17?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 36 and take away the sum of its digits. What do you get?
  26. 26.?359 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?038 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.14?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 52 and take away the sum of its digits. What do you get?
  30. 30.63?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.6?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?281 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 70 and take away the sum of its digits. What do you get?
  35. 35.4?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.8?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 73 and take away the sum of its digits. What do you get?
  39. 39.Take 72 and take away the sum of its digits. What do you get?
  40. 40.53?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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