When writing and working with very large or very small numbers, we use standard form.
Standard form shows the size of numbers as powers of ten.
Standard from numbers are written as:
A × 10n
where: A is a number greater than 1 but less than 10 and n is the index or power.
We use standard form with:
|Large numbers||A population of 120,000,000 microorganisms could be written as 1.2 × 108|
|Small numbers||A red blood cell's diameter of 7 μm or 0.000007 m could be written as 7 × 10−6 m|
|Calculations||When multiplying: add powers. When dividing: subtract powers.|