This point had already occurred to Loretta, who was doing some rapid calculations.

The older man took in his situation and did some rapid mental calculations.

The engineers did rapid calculations to make sure the span could support the weight, officials said.

To divert her trend of thought, she ran a rapid calculation.

He did a bit of rapid calculation and it was strictly unbelievable.

I stood up, the better to see the state of the causeway, and made some rapid calculations.

He whipped out a slide rule and began making rapid calculations.

He can perform rapid and complicated calculations in his head.

He took a slide rule from a drawer and did some rapid calculation.

His eyes became unfocused as rapid calculations went on behind them, then: "Three days."