Evaluate :

(1.3)²

We have:

(1.3)² = 1.3 × 1.3

First we multiply 13 by 13

$\begin{matrix} & & 1 & 3 \ \times & & 1 & 3 \ \hline & & 3 & 9 \ & 1 & 3 & \times \ \hline & \bold{1} & \bold{6} & \bold{9} \end{matrix}$

∴ 13 × 13 = 169

Sum of decimal places in given decimals = (1 + 1) = 2

So, the product contains 2 places of decimal

∴ (1.3)² = 1.69