Find the product :

1.2 x 3.5 x 0.3

First we multiply 12 by 35 and then by 3

$\begin{matrix} & & 1 & 2 \ \times & & 3 & 5 \ \hline & & 6 & 0 \ & 3 & 6 & \times \ \hline & \bold{4} & \bold{2} & \bold{0} \end{matrix}$

∴ 12 × 35 = 420

$\begin{matrix} & & 4 & 2 & 0 \ \times & & & & 3 \ \hline & \bold{1} & \bold{2} & \bold{6} & \bold{0} \end{matrix}$

∴ 12 × 35 × 3 = 1260

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

So, the product contains 3 places of decimal

∴ 1.2 × 3.5 × 0.3 = 1.260 = 1.26