This program can perform very complex calculations.

He is interested in ancient mathematics.

How much is the calculation for this product?

I am good at solving multiplication problems.

He is good at elementary arithmetic, and can solve calculation problems quickly.

No problem, I will do that job.

That proposal is completely unthinkable.

As a practical question, how are we going to fund this project?

This exam is a matter of life or death for me.

He is viewing that situation as a serious problem.