I opened all the bills and did some quick mental arithmetic.

Pele did some quick arithmetic and made some public comments that there might have been some chicanery.

Doing the quick arithmetic, Lyons figured the Peterbilt was only three miles ahead of them.

She did some quick mental arithmetic.

Then I measured off some more distances and did some more quick arithmetic.

The human was doing some quick mental arithmetic.

But after some quick arithmetic, they could not be sure the trip had been a rousing success.

Larry Muse did some quick arithmetic to calculate how much of their collective lives they had devoted to the industry.

I counted packages and did some quick mental arithmetic, then did it again because I didn't believe the results the first time.

I did some quick arithmetic.