Guess the crossed out number. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Guess the crossed out number. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

The magician announces:

1. Write down any four-digit number so that I can't see it.
2. Now write down a number from the same digits, but swap them.
3. Subtract the smaller number from the larger number, cross out one digit in the resulting difference and tell me the sum of the remaining digits, and I will guess which number you crossed out.

Focus secret:

The sum of the digits in the difference is always a multiple of 9 (9 or 18), it remains only to subtract the sum of the remaining digits from 18 or 9.

Example: 5789 and 9857; 9857 - 5789=4068. For example, the number 4 is crossed out, then 18-(6+8) =4.

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