Question

multiply.
\

$$\begin{array}{r} 6.57 \\\\ \\underline{\\times\\ 20.9} \\\\ \\end{array}$$

\square

Explanation:

Step1: Ignore decimals, multiply integers

$657 \times 209 = 657\times(200+9) = 657\times200 + 657\times9 = 131400 + 5913 = 137313$

Step2: Count total decimal places

6.57 has 2 decimals, 20.9 has 1 decimal. Total: $2+1=3$

Step3: Place decimal in result

Move decimal 3 places left in 137313: $137.313$

Answer:

$137.313$