How do you calculate the annualized values for "Deduction for Qualified Business Income"?

I'm trying to fill out this form in TurboTax and would like to know the correct way to calculate the Annualized values to enter on this screen:

 
deduction-for-qualified-business-income.png

 

And why doesn't TurboTax guide me to calculate these values rather than expecting me to figure it out?