epdf.pub_cbest-cliffs-test-prep13a9b242c7cb4125e6cca92d00a73d5a41681

Part IV: Mathematics Review
For example:
2
10 - 3 # 6 + 10 + ^6 + 1h#
4 =
2
10 - 3 # 6 + 10 + ^7h
# 4 = (parentheses first)
10 - 3 # 6 + 100 + ^7h
# 4 = (powers next)
10 - 18 + 100 + 28 = (multiplication, or division)
- 8 + 100 + 28 = (addition/subtraction, left to right)
92 + 28 = 120
An easy way to remember the order of operations after parentheses is: Please My
Dear Aunt Sarah (Powers, Multiplication, Division, Addition, Subtraction).
Arithmetic Mean or Average
To find the average of a group of numbers:
1. Add them up.
2. Divide by the number of items you added.
For example:
What is the average of 10, 20, 35, 40, and 45?
10 + 20 + 35 + 40 + 45 = 150
150 ' 5 = 30
The average is 30.
What is the average of 0, 12, 18, 20, 31, and 45?
0 + 12 + 18 + 20 + 31 + 45 = 126
126 ' 6 = 21
The average is 21.
What is the average of 25, 27, 27, and 27?
25 + 27 + 27 + 27 = 106
126 ' 4 = 26 1
⁄2
The average is 26 1 ⁄2.
210