Indirect binding math

Hello, I have a template with a textbox showing a number that I would like to do some math on. But it says I can't nest variables. Is there a workaround for this? Thank you!

This is what I did under Property>Expression:
{[default]DEVICEs/fbDEVICE{DEVICE.DEVICENumber}/fNumber}*320/100

Add and internal parameter to your template. Use indirect tag binding to bring the tag value, with dynamic substitution, to that internal parameter. In your original expression, replace the tag reference with the property reference to that internal parameter.

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