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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 744 · 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. 1.42?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.1?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.426? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.574? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?718 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.51?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 21 and take away the sum of its digits. What do you get?
  8. 8.Take 58 and take away the sum of its digits. What do you get?
  9. 9.71?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?436 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 18 and take away the sum of its digits. What do you get?
  12. 12.Take 22 and take away the sum of its digits. What do you get?
  13. 13.Take 98 and take away the sum of its digits. What do you get?
  14. 14.Take 49 and take away the sum of its digits. What do you get?
  15. 15.?354 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 16 and take away the sum of its digits. What do you get?
  18. 18.Take 35 and take away the sum of its digits. What do you get?
  19. 19.4?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?247 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.68?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 89 and take away the sum of its digits. What do you get?
  23. 23.42?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 55 and take away the sum of its digits. What do you get?
  25. 25.Take 25 and take away the sum of its digits. What do you get?
  26. 26.883? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 66 and take away the sum of its digits. What do you get?
  28. 28.573? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?715 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 56 and take away the sum of its digits. What do you get?
  31. 31.Take 28 and take away the sum of its digits. What do you get?
  32. 32.285? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?836 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 78 and take away the sum of its digits. What do you get?
  36. 36.86? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 26 and take away the sum of its digits. What do you get?
  38. 38.?222 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.72?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.14?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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