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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 576 · 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. 1.6?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 48 and take away the sum of its digits. What do you get?
  3. 3.Take 61 and take away the sum of its digits. What do you get?
  4. 4.491? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 11 and take away the sum of its digits. What do you get?
  6. 6.?022 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 75 and take away the sum of its digits. What do you get?
  9. 9.?262 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?245 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.3?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 43 and take away the sum of its digits. What do you get?
  13. 13.Take 26 and take away the sum of its digits. What do you get?
  14. 14.?854 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 79 and take away the sum of its digits. What do you get?
  16. 16.Take 65 and take away the sum of its digits. What do you get?
  17. 17.590? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 95 and take away the sum of its digits. What do you get?
  19. 19.764? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 56 and take away the sum of its digits. What do you get?
  21. 21.16?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?475 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.6?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.83?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?624 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?453 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 12 and take away the sum of its digits. What do you get?
  29. 29.6?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.873? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 84 and take away the sum of its digits. What do you get?
  32. 32.201? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.802? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.332? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?723 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 96 and take away the sum of its digits. What do you get?
  37. 37.70?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 34 and take away the sum of its digits. What do you get?
  39. 39.Take 33 and take away the sum of its digits. What do you get?
  40. 40.Take 53 and take away the sum of its digits. What do you get?

Answer key

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

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