Question

find the product. 21.6•2.1 21.6•2.1 = (type an integer or a decimal.)

Explanation:

Step1: Multiply the numbers as integers

First, we consider 21.6 and 2.1 as 216 and 21 (ignoring the decimals for now). So we calculate \(216\times21\).
\(216\times21 = 216\times(20 + 1)=216\times20+216\times1 = 4320+216 = 4536\)

Step2: Determine the decimal places

The number 21.6 has 1 decimal place and 2.1 has 1 decimal place. So in total, the product should have \(1 + 1=2\) decimal places.
We take the product we got in Step 1 (4536) and place the decimal point 2 places from the right. So we get \(\frac{4536}{100}=45.36\)

Answer:

45.36