In the math test, the problems about operators were the most difficult.

He was doing complex calculations in his head.

If you make a mistake in the operation, the result will also be wrong.

The processor of this computer is very fast.

What does this numeric value mean?

This math problem needs to be solved using the correct operator.

He calculated the numbers in his head.

This operation is too complex for me to understand.

This processor is very fast.

Numerical analysis is a branch of mathematics that studies techniques and theories for solving mathematical problems numerically.