Question

Multiply $0.9\times 0.15$

Answer 1

Multiplying decimal numbers-

Ignore the decimal point and multiply

$9\times 15=135$ $\left[\because 09=9,015=15\right]$

Count the number of digits after the decimal point in both the numbers, we have $1$digit after decimal in $0.9$ and $2$digits in $0.15$

So, place the decimal after three digits from the right in the product. $\left[\because 1+2=3\right]$

$0.9\times 0.15=0.135$

Hence , product of $0.9\times 0.15$ is $0.135$