Resetting a numeric question

I have a number of numeric questions in my project. There is no need for a Results slide. I have set the properties of the slide to 'Reset to initial state'.

If a person enters a number in the data box which is wrong, they continue from the Incorrect layer of that slide to another slide where they can see how to work out the problem.

They then return to the numeric question slide to have another go.

Their initial answer remains in the data entry box. They can overtype this.

Is there a way (a variable?) to remove their initial answer/make the data entry box blank) upon their return to the quiz slide?

Thanks

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