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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 196 · 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 69 and take away the sum of its digits. What do you get?
  2. 2.Take 43 and take away the sum of its digits. What do you get?
  3. 3.?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 47 and take away the sum of its digits. What do you get?
  5. 5.?595 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.7?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?132 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?448 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.566? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?506 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.859? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?408 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 25 and take away the sum of its digits. What do you get?
  14. 14.388? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?071 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.3?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 40 and take away the sum of its digits. What do you get?
  18. 18.?429 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?695 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?112 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.4?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 33 and take away the sum of its digits. What do you get?
  23. 23.?089 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.804? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 49 and take away the sum of its digits. What do you get?
  26. 26.?014 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 63 and take away the sum of its digits. What do you get?
  28. 28.Take 80 and take away the sum of its digits. What do you get?
  29. 29.Take 32 and take away the sum of its digits. What do you get?
  30. 30.7?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.4?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.415? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.1?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 94 and take away the sum of its digits. What do you get?
  35. 35.Take 53 and take away the sum of its digits. What do you get?
  36. 36.Take 45 and take away the sum of its digits. What do you get?
  37. 37.Take 72 and take away the sum of its digits. What do you get?
  38. 38.?340 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.2?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 15 and take away the sum of its digits. What do you get?

Answer key

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

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