Week of May 18th - 22nd

We will spend the first half of the week talking about and reviewing rates and working with tables, line graphs and rules (algebraic expressions) to identify unknown values.

RATES:
Rates are the relationship between two quantities that have different units. For example, miles and hours (miles per hour - speed), dollars and pounds (how much something costs by the pound), hours and dollars (how much you get paid by the hour).

Rates are often expressed with phrases that include the word per, as in miles per hour, dollars per pound.

When we are working with rates we can use a table that shows the relationship between two value, or a graph with one value on the X-axis and the other on the Y-axis. We can also write a rule or use an algebraic expression to show the relationship.

For example: Joan's car uses 1 gallon of gasoline every 28 miles.

Rule: Distance equals 28 times the number of gallons of gasoline
Algebraic Expression: d = 28*g
Table: The table would just have each value in each column and as the gallons of gasoline increase by one the distacne would multiply by 28.

Graph: A graph would have distance on the Y-Axis and Gasoline on the X-Axis and would have a line that starts at (0,0) and increases up to the right going up 28 miles for every gallon of gasoline.

Looking at Graphs:
We will practice reading different graphs and looking at using our logic to figure out what a graph represents.

PI π

The later part of the week we will begin learning about pi (π) and finding the circumference and area of a circle.

You can use the pi button (π) on your calculator or use 3.14 as an estimation of pi (π).

Circumference of a circle: C = π * diameter

Area of a circle: A = π * radius^2 (squared or radius times radius)