1. Math 5-4: Warm-up

2. Math 5-4: Finding Percents Mentally
Objective: How to compute mentally with percents.

3. Finding Percents Mentally
1% - move decimal point 2 places to left
1% of 195 = 0.01 x 195 or 1.95
10% - move decimal point 1 place to left
10% of 3.9 = 0.10 xf 3.9 or 0.39

4. Finding Percents Mentally
other common percents:
easier to use fraction form of the percent
use cheat sheet
25% of 68 = ¼ x 68 or 17
33 1/3% of 57 = 1/3 x 57 or 19

5. Examples
40% of 80
66 2/3% of 75
10% of 65
1% of 304

6. Assignment 5-4 PS (o) Quiz: Lessons 3-6 – 11/10
Chapter 5 TEST – 11/17