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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 848 · 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.Take 60 and take away the sum of its digits. What do you get?
  2. 2.?350 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.212? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.7?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.27?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.2?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.400? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 64 and take away the sum of its digits. What do you get?
  9. 9.5?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 22 and take away the sum of its digits. What do you get?
  11. 11.6?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.75?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.59?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 36 and take away the sum of its digits. What do you get?
  16. 16.Take 49 and take away the sum of its digits. What do you get?
  17. 17.7?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?707 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 95 and take away the sum of its digits. What do you get?
  20. 20.7?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.12?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.19?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?104 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.26?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?569 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.349? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.2?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 18 and take away the sum of its digits. What do you get?
  30. 30.2?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.41?0 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. 33.34?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?354 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.359? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.852? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.6?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.185? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.66?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.3?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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