Chapter 0.3, Problem 15E

To determine

To calculate:have calculated product of the given value.

Answer to Problem 15E

Product of the given value is 105.35

Explanation of Solution

Given that: $21.5\times 4.9$

Calculation:

Step 1 - The given decimal numbers are multiplied in the same manner as the whole number, Overlook the decimal point.

  $\begin{array}{c}\begin{array}{l}21.5\\ \times 4.9\end{array}\\ \begin{array}{l}1935\\ 86.0\end{array}\\ 10535\end{array}$

Step 2 - compute the number of decimals in the given product, and place the decimal point in the product.

  $\begin{array}{c}\begin{array}{l}21.5\leftarrow 1\text{decimal digit}\\ \times 4.9\leftarrow 1\text{ decimal digit}\end{array}\\ \begin{array}{l}1935\\ 86.0\end{array}\\ 105.35\leftarrow 2\text{ decimal digit}\end{array}$