Standard form is where you change very big or small numbers with lots of zeros into something more manageable e.g. 0.017 can be written as 1.7 × 10 to the power of minus 2. To do this you move the decimal left or right.
The number of places the decimal point moves is then represented by a power of 10 - positive if the decimal point's moved to the left, and negative if moved right.
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