Exercise 9 Page 134

According to the order of operations, multiplication and division are evaluated before addition and subtraction. For the given expression, this means evaluating the multiplications and division before addition and subtraction.

6+4 * 5 ÷ 2- 8 * 1.5 Let's do it!

Operation	Before Simplification	After Simplification
Multiply	6+ 4 * 5 ÷ 2- 8 * 1.5	6+ 20 ÷ 2 - 12
Divide	6+ 20 ÷ 2 - 12	6+ 10-12
Add terms	6+ 10-12	16-12
Subtract term	16- 12	4

The expression equals 4.

Alternative Solution

Using a Calculator

We can also evaluate this expression using a calculator. To do so, type it as shown below.