He drew a cross.

Calculating vectors is an important part of mathematics.

He was calculating in his head.

He was able to solve the complex calculation quickly.

It became as cold as the snow piling up.

This math problem requires finding the product.

What is the volume of this box?

I love cross-stitch and I make a little progress every day.

This column vector is a basic concept of linear algebra.

A row vector is one of the basic concepts in linear algebra.