Some people are able to do maths and could prob answer any maths questions. There are some people (like you obviously) who just cant do maths and struggle with the concept! LOL
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Math
those student want to become engineeer. they should learn math.
Practise.The more mental arithmetic that you do the more your brain will adapt itself to perform these tasks. This will allow you to do so more quickly. This really is the only answer. It is similar to everything else really. If you want to become a better footballer you practise playing football. If you want to become a better mathematician you practise mathematics!
Most of the things you will do will require some math. If you want new drapes for your house you will need to know how to measure for it and to do area. Your paycheck requires math as well as your budget. Taxes require math. If you want to know how many gallons to a mile you get in your car you need math. Cooking requires math. Suppose you want to double a recipe you need math. Ignorance in any area guarantees that you will have problems in everyday life. You don't need to be a rocket scientist but you do need to know basic math.