His mind did a quick calculation: they were almost in weapons range.

The young man held it up to the sun and made some quick calculations.

I looked up the valley and did a quick calculation.

He did some quick calculations on what weight had been lost.

We'll have to do some quick calculations to determine exactly.

He made a quick calculation in his mind and added up a total of about $1,100.

With less than 45 minutes until the meeting, you do a quick mental calculation.

Jones did some quick calculations and then looked at Cook.

She did a series of quick calculations, her lips moving.

A quick calculation told me that the room we were in was almost exactly the size of my house.