Proportions with Two Variables

A ratio is

• comparing a bunch of numbers

• a comparison between 2 quantities

• an estimation of an amount

• a variable

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

A proportion is a

• ratio statement

• an "if-then" statement

• a statement of 2 ratios

• a comparison

Tags

CCSS.7.RP.A.2A

To solve for missing info in a proportion statement you must first

• Cross multiply

• Divide everything

• Get rid of variables

• Guess

Tags

CCSS.7.RP.A.3

Two out of every 3 students in Mr. Pearson’s ninth grade class recycle aluminum cans. If 48 students recycle aluminum cans, HOW MANY STUDENTS are in Mr. Pearson’s class?

Tags

CCSS.6.RP.A.3B

Sandra wants to give a party for 60 people. She has a punch recipe that makes 2 gallons of punch and serves 15 people. How many gallons of punch should she make for her party?

Tags

CCSS.6.RP.A.3B

A model airplane is made to the scale 1 inch to 24 inches. If the wing of the actual plane is 18 feet long, how long will the model wing be in inches?

Tags

CCSS.7.RP.A.2C

If a class has 14 redheads, 8 brunettes, and 6 blondes- What is the REDUCED ratio of redheads to brunettes?

• 4:7

• 14:8

• 8:14

• 7:4

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

If a class has 14 redheads, 8 brunettes, and 6 blondes- What is the REDUCED ratio of redheads to blondes?

• 3:7

• 14:6

• 6:14

• 7:3

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Cindy’s job is to check computer printers for defects. Out of 420 printers she has to check, only 3 of the first 84 have been defective. Using this information, what is the best prediction of the TOTAL NUMBER OF DEFECTIVE PRINTERS?(Set up your ratio)

Tags

CCSS.6.RP.A.3B

When determining the expected counts from a two way table, which formula should we use?

• (row total)(column total)/table total

• Number of categories minus 1

• row total minus 1

• column total minus 1