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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 183 · 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 35 and take away the sum of its digits. What do you get?
  2. 2.Take 72 and take away the sum of its digits. What do you get?
  3. 3.Take 84 and take away the sum of its digits. What do you get?
  4. 4.?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.1?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 38 and take away the sum of its digits. What do you get?
  7. 7.?592 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?214 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?628 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.374? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.63?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 82 and take away the sum of its digits. What do you get?
  14. 14.?730 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.16?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.59?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.7?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 40 and take away the sum of its digits. What do you get?
  19. 19.16?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?086 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?754 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.2?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?458 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?348 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?755 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.426? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.67?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?278 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.3?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?850 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?570 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.22?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?777 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 76 and take away the sum of its digits. What do you get?
  36. 36.47?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.89?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.2?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?552 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.20?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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