Even if you have your fancy calculator and solves the question fast. It's about understanding and that is understanding from the scratch. The important to understand and memorize in your head is the four operation, addition, subtraction, division and multiplication.
It is very important that you have to understand and knowledge of the basic skills for rest of your life. In my life, most of my day is maths. Everything is all about mathematics, you can't just get away from mathematics, it follows you all the time.
Although there's lots of formulas to you to memorize, understand and knowledge but these formulas are all about the four operation.
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