Question

what is scientific notation and also give some examples

Answer 1

It is the method of writing, or of displaying real numbers as a decimal number between 1 and 10 followed by an integer power of 10
Like showing
$0.00236 \: as \: 2.36 \times {10}^{ - 3}$
$0.0000854 \: as \: 8.54 \times {10}^{ - 5}$