Answer:
x*10ⁿ (units)
Step-by-step explanation:
Scientific notation never has leading or trailing zeros.
0.0064 would be expressed as 6.4*10³
6400 would be expressed as 6.4*10³
multiplying by 10 to an exponent just adds or subtracts zeros, so count how many zeros have to be added or subtracted, and multiply by 10ⁿ, where n is how far from the decimal point.