Find the product :

0.028 x 0.9

First we multiply 28 by 9

$\begin{matrix} & & 2 & 8 \ \times & & & 9 \ \hline & \bold{2} & \bold{5} & \bold{2} \end{matrix}$

Clearly, 28 × 9 = 252

Sum of decimal places in given decimals = (3 + 1) = 4

So, the product contains 4 places of decimal

∴ 0.028 × 0.9 = 0.0252