Equivalent Ratios

What we know:

• They are a comparison between 2 quantities
• They can be part-to-whole
• They can be part-to-part
• They can be expressed three ways- 2:3, 2 to 3 or 2/3

Create a ratio statement

hamburger to cheese

What is the ratios of tires to a car?

If I have three cars, how many tires do I have?

A proportion is a statement saying two ratios are equivalent.

How do we make equivalent ratios?

A store has a sale. T shirts are 2 for $18. What would 6 shirts cost?

How many shirts could you buy for $45?

How do we see if two ratios are proportional?

• Write as a fraction and determine common denominator
• Cross multiply
• Divide to see if quotients are =

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Out of the 32 students in health class, 24 prefer using gel toothpaste. based on these results, how many of the 500 students in the school can be expected to prefer using gel toothpaste?