Bell Work

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Bell Work - PowerPoint PPT Presentation

Bell Work. Find the unit rate:. \$54 6 lbs. \$9.00 per pound. 500 miles 10 hours. 50 miles per hour. \$42___ 6 people. \$7.00 per person. Proportions. Proportions. A proportion is an equation that states that two ratios are equivalent. Example: 2 12

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Bell Work

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Presentation Transcript

Bell Work

Find the unit rate:

\$54

6 lbs

\$9.00 per pound

500 miles

10 hours

50 miles per hour

\$42___

6 people

\$7.00 per person

Proportions

Proportions

A proportion is an equation that states

that two ratios are equivalent.

Example:

2 12

3 18

=

=

5 15

9 27

If one of the numbers in a proportion is unknown, mental math can be used to find an equivalent ratio.

Example 1:

=

2 6

3 x

x 3

=

2 6

3 x

Hint: To find the value of x, multiply 3 by 3 also.

=

2 6

3 9

x 3

If one of the numbers in a proportion is unknown, mental math can be used to find an equivalent ratio.

Example :

=

28 7

32 x

÷

4

=

Hint: To find the value of x, divide 32 by 4 also.

28 7

32 x

=

28 7

328

÷

4

In a proportion, the cross products are equal.

=

530

2 12

They are a proportion because they equal the same number

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.

Proportion
• Tires cost two for \$75. How much will four tires cost?
• # of tirescost

n = 150, so four tires cost \$150