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Practice is the best way - that being said there are some tricks you can use.It's often easier to change the way you represent a number. For example, consider 99 x 8799 is very close to 100, which is a mu...

V = 1/3π x (6x6) x 5V = 1/3π x 36 x 5V = 1/3π x 180V = 60π

Sometimes in maths you will encounter equations with an unknown value, such as X+3=7. Though this is a very simple example that you can probably do in your head without thinkig much, knowing the principle...

First multiply out the bracketsMultiply each component within the bracket by 4 (4 x 3x) + (4 x -7) = 812x - 28 = 8 Now you want to ensure you have the x's on their ownYou can eliminate the -28 by adding 2...

First we need to find the fourth and fifth term. So between first and second term we've added 4b, the same between the second and third term. To get to the fourth term we'd add 4b again to get a+14b, then...