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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 71 · 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. 1.7?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 89 and take away the sum of its digits. What do you get?
  3. 3.Take 52 and take away the sum of its digits. What do you get?
  4. 4.Take 27 and take away the sum of its digits. What do you get?
  5. 5.11?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.79?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?967 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 46 and take away the sum of its digits. What do you get?
  9. 9.Take 17 and take away the sum of its digits. What do you get?
  10. 10.160? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.357? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.27?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 94 and take away the sum of its digits. What do you get?
  14. 14.?185 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.96? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?147 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?217 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.50?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?988 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.506? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 98 and take away the sum of its digits. What do you get?
  22. 22.?202 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.7?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.53?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 53 and take away the sum of its digits. What do you get?
  26. 26.?485 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 34 and take away the sum of its digits. What do you get?
  28. 28.Take 56 and take away the sum of its digits. What do you get?
  29. 29.Take 22 and take away the sum of its digits. What do you get?
  30. 30.?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 93 and take away the sum of its digits. What do you get?
  32. 32.402? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 49 and take away the sum of its digits. What do you get?
  34. 34.Take 75 and take away the sum of its digits. What do you get?
  35. 35.6?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 50 and take away the sum of its digits. What do you get?
  37. 37.Take 26 and take away the sum of its digits. What do you get?
  38. 38.85?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.846? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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