#4) 43 - 16 = ?

#5) 55 - 28 = ?

The above sums are simple. Yet most people would do them hard way: by working from right-to-left, and trying to remember a "carry digit".

The method you've just learned is based on an ancient formula (or 'sutra') called "By Addition and Subtraction".

It's simple to learn, and after a few practice runs you'll use it instinctively.

A few tips to help you:

- Always relax when you're doing mental math (or when performing any mental activity for that matter).

- Never strain your mind - natural way is best.

- And remember, you're only ever competing with yourself. Go at pace that's most comfortable for YOU!

Like most things in life, there's an easy way and an unlimited number of difficult ways.

Be good to yourself and get used to finding easy way,

Your whole life will run smoother as a result.

3: Are they charging by time, or by project?

Amateur software developers tend to charge for their time, not by value of work they perform; so do contract programmers. Real software developers, though, charge based on value provided to you - that is, by project - NOT based on time. This is because amateurs are afraid that they won't be able to complete project in a reasonable amount of time, so they want reassurance that they'll be paid for their time in any situation. Experienced software developers, though, are confident in their ability to deliver code under their estimate, they are confident in their ability to provide value, and they that they can provide value that's worth MORE than their time is. You shouldn't be making an investment decision every time you consider calling your software developer.

4: Are they trying to give a solution before they know problem?

Some developers will offer to send you a proposal after a ten or twenty minute phone conversation. It is impossible to accurately assess your situation that quickly; they are trying to provide you with a 'one-size-fits-all' package. Real software developers will not provide you with answers, proposals, or fees until they know enough about your business to have an informed opinion. Unless your developer is willing to spend enough time to really know what your problem is, you won't end up with solution that you really need, because your developer is making random shots in dark.