Two times for validation!

The data collector sometimes enters a wrong value for a question such as (How much do you get)
It can write 8000 and it only means 800
The question: How can I create a code so that if he wrote 8000 times, and the second time he wrote 800, a message appears that prevents him from continuing until the wrong number is corrected
In other words: How can I create a code that resembles a code to rewrite the password, for example for verification?
But for the numbers as a means of verification so that the data collector makes the adjustment directly
Thank you so much.

If your first question was question1 and the second is question2, you can enter the following in the validation criteria of question2:

.=${question1}

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