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# General Methods/checking. Watch

1. Hey.
What is the best way to avoid mistakes?
Such as sign errors/ ambiguous fractions.

What general checking procedures do you follow?

I find most of my mistakes are the results of one of the two examples, but im not sure of the best layout/method to avoid them.

Thanks
2. (Original post by SamuelN98)
Hey.
What is the best way to avoid mistakes?
Such as sign errors/ ambiguous fractions.

What general checking procedures do you follow?

I find most of my mistakes are the results of one of the two examples, but im not sure of the best layout/method to avoid them.

Thanks
Check each answer by a different method (e.g. substituting back into an equation).
Also see if it possible to deduce anything that looks "wrong" from your answers: if so, you know that they themselves must be wrong.
3. In an exam, try and do all the tricky questions twice - or the ones where there is a lot of algebraic manipulation where a simple mistake could have been made.
If you do it twice independently and don't get the same answer then you need to check what you've done.
4. Try and sanity check your answers, is the RHS always positive and the LHS always negative, maybe the RHS is always odd and the RHS is even, is there a discontinuity in your answer even though you can guess it should be a smooth function, etc...

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