7.RP.

• 2a Decide whether two quantities are in a proportional relationship

• 2b Identify the constant of proportionality

• 2c Represent proportional relationships by equations

• 2d Explain what a point (x,y) on the graph of a proportional relationship means in terms of the situation

Decide whether two quantities are in a proportional relationship

2b Identify the constant of proportionality

​We know the CoP is 200 because when x = 1, y = 200

2c Represent proportional relationships by equations

Selena and Dylan studied the data in the table. They each wrote an equation to represent the relationship between the number of students and the number of pizzas ordered. Who is correct?

BOTH are correct

2c Represent proportional relationships by equations

Selena and Dylan studied the data in the table. They each wrote an equation to represent the relationship between the number of students and the number of pizzas ordered. Who is correct?

BOTH are correct

​Write this somewhere in your journal with the 7rp2 notes

2d Explain what a point (x,y) on the graph of a proportional relationship means in terms of the situation

Determine what the value of A means in each problem.

Let's go back and talk about Percents

You should have notes in your journal.

Percentages are a rate per 100.

Percentages are fractions that always have 100 as the denominator.

We use % as the symbol to represent percents

Finding Percents of a Number:Method One

Finding Percents of a Number Method Two

1.Write the percent as a decimal by moving the decimal two places to the left in the percent

(35% ----> 0.35)

2 Multiply the quantity times the decimal

(0.35 x 80 = 28)

Finding a Whole Given % and Part

Examples:

• 5 is 10% of what number?

• There are 16 boys in the classroom. This is 80% of the class. How many total students are in the classroom?​

  • Here, we have a part and a percent. We know we have a part because percent is always out of 100%. We do not have 100% in these type of problems!​ The problems are saying the number we have is that percentage.

Finding Whole Given Part and %

Example: 5 is 10% of what number?

• This problem is stating 5 = 10%. We should recognize that ​since

  5 = 10%, we are missing the whole number.

• Step 1: write your equation of % x whole = ​part

  • 10% x whole = 5

• ​Step 2: change your percent into a decimal

Finding whole given part and %

Finding whole given part and %

Some text here about the topic of discussion

How Do I Know Which Problem is Which?

Finding Percent of a Number vs Finding a Whole Given Part and Percent

• Finding a percent: the problem gives you a percent and a number. The number is the whole number and we are trying to find what number the percentage represents. What is 10% of 100. The word of means what part of 100 is 10%

Finding Whole Given Part and Percent

• Here, the Percent is the number given. 20 is 10% of what number?

  • The sentence is saying 20 = 10%...we know that percent is out of 100% so 20 is not the whole. It is also saying that of what number? Meaning the missing number is the big/whole number!

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