mental arithmetic

He looked at his watch and did fast mental arithmetic.

Then I did a little mental arithmetic and figured it out.

They had to be set off one against the other by a process of rapid mental arithmetic.

She lifted her head, and he could almost see the mental arithmetic "Five whole months!"

He looked like a man trying to do a complicated piece of mental arithmetic.

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

He did quick mental arithmetic and named a large sum.

Mental arithmetic and fast thinking are necessary skills for competitive play.

One produced stress by exercises in mental arithmetic against time.

It was mental arithmetic - to someone who understood circles.

Jack did some mental arithmetic and decided it was evening on the other side of the pond.

But before he can keep them, he has to do some mental arithmetic.

Time passed, enough time for him to do some mental arithmetic.

I could not arrive at the reasons why the first ten minutes of every morning were devoted to something called mental arithmetic.

I still didn't have a fix on the mental arithmetic, but the money was clearly huge.

Duncan was doing some mental arithmetic, and finding the results very depressing.

It was a surprise in both the trial schools that molecules could make mental arithmetic so popular.

Jack checked his watch and did the mental arithmetic.

I have long known that my mastery of mental arithmetic has been slowly deteriorating.

The mental arithmetic taught in the school was "highly commended."

Chuckling, he did some mental arithmetic and told her.

Fender could almost hear the clicking of mental arithmetic going on around the hall.

My late father was good at mental arithmetic.

I turn a rusty handle in the part of my brain that handles mental arithmetic.

She was silent a moment as she checked his mental arithmetic.