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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 902 · 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. 1.274? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.8?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 49 and take away the sum of its digits. What do you get?
  4. 4.183? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.54?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.6?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 43 and take away the sum of its digits. What do you get?
  8. 8.Take 81 and take away the sum of its digits. What do you get?
  9. 9.3?38 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 33 and take away the sum of its digits. What do you get?
  11. 11.?638 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 19 and take away the sum of its digits. What do you get?
  13. 13.51?7 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. 15.69?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.84?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.7?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.3?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?014 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?255 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.193? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 12 and take away the sum of its digits. What do you get?
  23. 23.21?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 29 and take away the sum of its digits. What do you get?
  25. 25.36? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 54 and take away the sum of its digits. What do you get?
  27. 27.Take 77 and take away the sum of its digits. What do you get?
  28. 28.826? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.4?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 64 and take away the sum of its digits. What do you get?
  31. 31.10?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.71? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.27? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?210 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?780 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?821 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.64?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.259? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.3?94 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. 36
  4. 6
  5. 3
  6. 2
  7. 36
  8. 72
  9. 4
  10. 27
  11. 1
  12. 9
  13. 5
  14. 36
  15. 3
  16. 5
  17. 9
  18. 3
  19. 4
  20. 6
  21. 5
  22. 9
  23. 7
  24. 18
  25. 9
  26. 45
  27. 63
  28. 2
  29. 4
  30. 54
  31. 7
  32. 1
  33. 1
  34. 9
  35. 6
  36. 3
  37. 7
  38. 3
  39. 2
  40. 2

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