Bell Work Find the unit rate: $54 6 lbs 500 miles 10 hours $42___ 6 people $9.00 per pound 50 miles per hour $7.00 per person.

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Presentation transcript:

Bell Work Find the unit rate: $54 6 lbs 500 miles 10 hours $42___ 6 people $9.00 per pound 50 miles per hour $7.00 per person

A proportion is an equation that states that two ratios are equivalent. Example: Proportions = =

If one of the numbers in a proportion is unknown, mental math can be used to find an equivalent ratio. Example 1: x x x Hint: To find the value of x, multiply 3 by 3 also x 3 = = =

If one of the numbers in a proportion is unknown, mental math can be used to find an equivalent ratio. Example : x x Hint: To find the value of x, divide 32 by 4 also = = = 4 ÷ ÷

Circle all of the ratios that are equivalent.

Solve the proportion using equivalent ratios?

In a proportion, the cross products are equal. = They are a proportion because they equal the same number

Check using cross products!

Use cross products to solve the proportion?

You Try: Use cross products to solve the proportion?

You Try: Solve the proportion?

 Proportion is a statement that says two ratios are equal. ◦ In an election, Damon got three votes for each two votes that Shannon got. Damon got 72 votes. How many votes did Shannon get? ◦ Damon Shannon n = 48, so Shannon got 48 votes.

 Tires cost two for $75. How much will four tires cost? ◦ # of tires cost n = 150, so four tires cost $150