Not being able to solve basic math problems in your mind (without a calculator) is still a problem. "Because you won't always have a calculator with you" just was the wrong argument.
You'll acquire advanced knowledge and skills much, much faster (and sometimes only) if you have the base knowledge and skills readily available in your mind. If you're learning about linear algebra but you have to type in every simple multiplication of numbers into a calculator...
You'll acquire advanced knowledge and skills much, much faster (and sometimes only) if you have the base knowledge and skills readily available in your mind. If you're learning about linear algebra but you have to type in every simple multiplication of numbers into a calculator...