Embed Size (px)
Citation preview
Lesson 8-1 Pages 334-337
Percent and Estimation
Lesson Check Ch 7
What you will learn!
How to estimate percents by using fractions and
decimals.
What you really need to know!
To estimate a percent of a number, you can use a fraction or a multiple of 10% or 1%.
What you really need to know!
10% makes a number one digit smaller!
1% makes a number two digits smaller!
Example 1:
Estimate 61% of 407.
60% of 400
10% of 400 = 40
6 x 40 = 240
Example 2:
Estimate 18% of 296.
20% of 300
10% of 300 = 30
2 x 30 = 60
Example 3:
Estimate 59% of 500.
60% of 500
10% of 500 = 50
6 x 50 is 300
Example 4:
Estimate 173% of 60.170% of 60
17 x 6
10% of 60 = 6
102
Example 5:
Estimate 1/3% of 898.1% of 900
1/3% is (1÷3)%, so…
1% x 900 = 9
9 ÷ 3
3
Example 6:
Last season 96,081 people were in attendance at a college football game. About 0.25% of those were reporters from newspapers and television and radio stations. About how many media people were present?
0.25% of 96,081
0.25% is the same as 1/4%
1% of 96,000
1% x 96,000 = 960
960 ÷ 4 = 240
About 240 media people
Page 336
Guided Practice
#’s 5-14
Pages 334-336 with someone at home and study
examples!
Read:
Homework: Page 337
#’s 15-34
#’s 36-46
Lesson Check 8-1
Link to Lesson 8-1 Review Problems
Page
582
Lesson 8-1
Lesson Check 8-1
