Checking for Proportionality

Presentation

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Mathematics

•

7th Grade

•

Medium

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CCSS

7.RP.A.2B, 7.EE.B.3, 7.RP.A.2A

Standards-aligned

Zachary Brown

Used 12+ times

FREE Resource

6 Slides • 4 Questions

Checking for Proportionality

Learning Target

I can determine if two ratios are proportionate.

Multiple Choice

Solve the proportion below.

\frac{3}{7}=\frac{t}{42}

t = 18

t = 15

t = 12

t = 9

Multiple Choice

1 cup of rice calls for 2.25 cups of water. If you only have 0.75 cups of rice, how much water is needed?

1 cup of water

3 cups of water

1.69 cups of water

1.125 cups of water

$\frac{2}{3}=\frac{4}{5}$

Determine if the proportion above is proportional (equal)

Proportional Relationships

$\frac{2}{3}=\frac{4}{5}$
Use cross products to determine.
$\left(2\right)\left(5\right)=\left(3\right)\left(4\right)$
$10\ne12$
The two ratios are not proportional

Proportional Relationships

$\frac{3}{4}=\frac{15}{20}$
Use cross products to determine if proportional
$\left(3\right)\left(20\right)=\left(4\right)\left(15\right)$
$60=60$
The two ratios are proportional

\frac{4}{5}=\frac{8}{11}

Use Cross Products to Determine if the Ratios are Proportional

Multiple Choice

Are the ratios equal?

$\frac{5}{6}=\frac{25}{30}$

They are proportional

They are NOT proportional

They are possibly proportional

Multiple Choice

What is the common factor to create the equal proportion?

$\frac{5}{6}=\frac{25}{30}$

Checking for Proportionality

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