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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 676 · 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. 1.546? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.200? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.451? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 14 and take away the sum of its digits. What do you get?
  5. 5.?384 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.3?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?874 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 35 and take away the sum of its digits. What do you get?
  10. 10.292? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.424? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?446 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?154 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?922 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 32 and take away the sum of its digits. What do you get?
  16. 16.?544 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?218 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 79 and take away the sum of its digits. What do you get?
  19. 19.?906 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.36? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?399 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 66 and take away the sum of its digits. What do you get?
  23. 23.?245 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.61?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 48 and take away the sum of its digits. What do you get?
  26. 26.Take 16 and take away the sum of its digits. What do you get?
  27. 27.5?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 75 and take away the sum of its digits. What do you get?
  29. 29.8?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.5?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 80 and take away the sum of its digits. What do you get?
  32. 32.30?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 94 and take away the sum of its digits. What do you get?
  35. 35.Take 88 and take away the sum of its digits. What do you get?
  36. 36.Take 89 and take away the sum of its digits. What do you get?
  37. 37.?512 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?250 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.2?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.80?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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