Lesson 7-3 Pages 297-300
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Lesson 7-3 Pages 297-300 Solving Proportions Lesson Check 7-2
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Lesson 7-3 Pages 297-300. Solving Proportions. Lesson Check 7-2. What you will learn!. How to solve proportions. Vocabulary. What you really need to know!. A proportion is an equation stating that two ratios are equivalent. Since rates are types of ratios, they can also form proportions. - PowerPoint PPT Presentation
Transcript of Lesson 7-3 Pages 297-300
Lesson 7-3 Pages 297-300
Solving Proportions
Lesson Check 7-2
What you will learn!
How to solve proportions.
ProportionProportionCross productCross product
What you really need to know!
A proportion is an equation stating that two ratios are equivalent. Since rates are types of ratios, they can also form proportions.
What you really need to know!
In a proportion, a cross product is the product of the numerator of one ratio and the denominator of the other ratio.
Example 1:
Determine whether 8/12 and 2/3 form a proportion.
3
2
12
8 3 x 8 = 24
12 x 2 = 24
YES!
Example 2:
Determine whether $5/8oz and $18/32oz form a proportion.
32oz
$18
8oz
$532 x 5 = 160
18 x 8 = 144
NO!
Example 3:
n
6
14
3.5 Solve
3.5n = 843.5 x n = 6 x 14
n = 24
Example 4:
According to specifications, the ratio of the length of the U.S. flag to its width must be 1.9 to 1. How long must a U.S. flag be if it is designed to have a width of 2.5 feet?
feet wide 2.5
longfeet ?
feet wide 1
longfeet 1.9
1.9 x 2.5 = 1 x ?4.75 = ?4.75 ft
Page 299
Guided Practice
#’s 4-15
Pages 297-298 with someone at home and study
examples!
Read:
Homework: Page 299-300
#’s 16-42 even
#’s 48-60
Lesson Check 7-3
Page
580
Lesson 7-3
Lesson Check 7-3
