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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 631 · 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. 1.42?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.520? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?615 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.87?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 57 and take away the sum of its digits. What do you get?
  6. 6.?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?278 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.8?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 82 and take away the sum of its digits. What do you get?
  10. 10.2?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.880? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 65 and take away the sum of its digits. What do you get?
  13. 13.63?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 52 and take away the sum of its digits. What do you get?
  15. 15.160? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 64 and take away the sum of its digits. What do you get?
  17. 17.?377 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 62 and take away the sum of its digits. What do you get?
  19. 19.Take 27 and take away the sum of its digits. What do you get?
  20. 20.?373 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.40?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.562? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.3?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.38?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.28?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?311 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 43 and take away the sum of its digits. What do you get?
  28. 28.?159 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 24 and take away the sum of its digits. What do you get?
  31. 31.89?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 13 and take away the sum of its digits. What do you get?
  33. 33.?987 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.16?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.7?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 17 and take away the sum of its digits. What do you get?
  37. 37.Take 25 and take away the sum of its digits. What do you get?
  38. 38.236? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.3?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.7?40 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. 2
  3. 6
  4. 3
  5. 45
  6. 3
  7. 1
  8. 5
  9. 72
  10. 8
  11. 2
  12. 54
  13. 2
  14. 45
  15. 2
  16. 54
  17. 1
  18. 54
  19. 18
  20. 5
  21. 9
  22. 5
  23. 5
  24. 7
  25. 5
  26. 4
  27. 36
  28. 3
  29. 27
  30. 18
  31. 2
  32. 9
  33. 3
  34. 2
  35. 9
  36. 9
  37. 18
  38. 7
  39. 6
  40. 7

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