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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 859 · 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. 1.493? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.54?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 20 and take away the sum of its digits. What do you get?
  4. 4.?338 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.6?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?501 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 98 and take away the sum of its digits. What do you get?
  8. 8.Take 70 and take away the sum of its digits. What do you get?
  9. 9.153? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.6?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?763 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 69 and take away the sum of its digits. What do you get?
  13. 13.71?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.620? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.3?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.2?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?426 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?241 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.4?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.41?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 13 and take away the sum of its digits. What do you get?
  23. 23.?932 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 57 and take away the sum of its digits. What do you get?
  25. 25.25?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 28 and take away the sum of its digits. What do you get?
  27. 27.42?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.7?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.73?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 14 and take away the sum of its digits. What do you get?
  31. 31.Take 34 and take away the sum of its digits. What do you get?
  32. 32.2?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 91 and take away the sum of its digits. What do you get?
  34. 34.?602 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 29 and take away the sum of its digits. What do you get?
  36. 36.5?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 62 and take away the sum of its digits. What do you get?
  38. 38.2?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 25 and take away the sum of its digits. What do you get?

Answer key

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

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