5-Minute check

Ratios, Proportions and the Geometric Mean6.1 ObjectivesStudents will analyze and solve problems

by writing and solving proportions.Why? So you can estimate bird

populations, as seen in Ex 62.Mastery is 80% or better on 5-minute

checks and practice problems.

Computing RatiosIf A and B are two quantities that are

measured in the same units, then the ratio of A to B is A/B. The ratio of A to B can also be written as A:B

Because a ratio is a quotient, its denominator cannot be zero. Ratios are usually expressed in simplified form. For instance, the ratio of 6:8 is usually simplified to 3:4. (You divided by 2)

Ex. 1: Simplifying Ratios

Pair Share- Simplifying Ratios

Ex. 2 – use a ratio to find a deminsion

Ex. 2 - cont

Ex. 3 - Using extended Ratios

Ex. 2-3: Pair Share

Ex. 4 - solve proportions

Ex. 4 - continued

Part 1 HW

Slide #12

360 1-10 all

Pair Share --

Ex. 5 – solving real world problems

Ex. 5 - Cont

Using ProportionsAn equation that

equates two ratios is called a proportion. For instance, if the ratio of a/b is equal to the ratio c/d; then the following proportion can be written:

= Means Extremes

The numbers a and d are the extremes of the proportions. The numbers b and c are the means of the proportion.

Ex. 6 - Find Geometric Means

Examples 5-6

Guided practice

Exit slips What was todays objective(s)?Students will analyze and solve problems

by writing and solving proportions.Why? So you can estimate bird

populations, as seen in Ex 62.Mastery is 80% or better on 5-minute

checks and practice problems.

HomeworkPage 360-362#12-58 even