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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 776 · 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 34 and take away the sum of its digits. What do you get?
  2. 2.Take 28 and take away the sum of its digits. What do you get?
  3. 3.49?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 42 and take away the sum of its digits. What do you get?
  5. 5.703? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.16?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.2?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.8?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 81 and take away the sum of its digits. What do you get?
  10. 10.23?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.38? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?772 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 60 and take away the sum of its digits. What do you get?
  16. 16.681? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 92 and take away the sum of its digits. What do you get?
  18. 18.Take 93 and take away the sum of its digits. What do you get?
  19. 19.2?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?600 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.32?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 59 and take away the sum of its digits. What do you get?
  24. 24.?996 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?214 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 58 and take away the sum of its digits. What do you get?
  27. 27.Take 47 and take away the sum of its digits. What do you get?
  28. 28.Take 72 and take away the sum of its digits. What do you get?
  29. 29.Take 64 and take away the sum of its digits. What do you get?
  30. 30.Take 80 and take away the sum of its digits. What do you get?
  31. 31.?142 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.1?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 26 and take away the sum of its digits. What do you get?
  34. 34.Take 78 and take away the sum of its digits. What do you get?
  35. 35.22?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.196? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?698 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 37 and take away the sum of its digits. What do you get?
  40. 40.Take 79 and take away the sum of its digits. What do you get?

Answer key

  1. 27
  2. 18
  3. 9
  4. 36
  5. 8
  6. 8
  7. 7
  8. 5
  9. 72
  10. 4
  11. 5
  12. 7
  13. 2
  14. 1
  15. 54
  16. 3
  17. 81
  18. 81
  19. 7
  20. 3
  21. 6
  22. 1
  23. 45
  24. 3
  25. 2
  26. 45
  27. 36
  28. 63
  29. 54
  30. 72
  31. 2
  32. 1
  33. 18
  34. 63
  35. 8
  36. 2
  37. 4
  38. 2
  39. 27
  40. 63

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