Brain like a computer: bad at math, good at everything else.

We all remember the painful arithmetic exercises at school. It takes at least a minute to multiply numbers like 3,752 and 6,901 with pencil and paper. Of course, today, when we have phones at hand, we can quickly check that the result of our exercise should be 25 892 552. Processors of modern phones can perform more than 100 billion of such operations per second. Moreover, these chips consume only a few watts, which makes them much more efficient than our slower brains, which consume 20 watts and require much more time to achieve the same result. Of course, the brain has not evolved to do arithmetic.