calculations involving addition, subtraction, multiplication or division carried out in the mind only rather than on paper or using a device such as a calculator
Practise mental arithmetic when you go out shopping.
the teaching of mental arithmetic
He's very good at mental arithmetic.
more emphasis on mental arithmetic
Many people cannot do mental arithmetic.
I'm going to ask you to do some mental arithmetic.
Examples of 'mental arithmetic' in a sentence
mental arithmetic
At its worst, it forced him to sit in a room too dark for writing and to work out problems by mental arithmetic.