Proportional Ratios

What is a proportion?

• Any equation with a variable

• The answer to a multiplication problem

• A set of two equal ratios

• The chances that something will happen

Tags

CCSS.7.RP.A.2A

What are two methods for determining whether two ratios are proportional? Make sure you select them BOTH.

• Simplifying

• Finding the reciprocal

• Finding the cross-products

• Adding them together

Tags

CCSS.7.RP.A.2A

How do we find cross-products?

• Multiply the ratios diagonally.

• Multiply the ratios horizontally.

• Multiply the ratios vertically.

• Multiply the ratios curvilinear-ly.

Tags

CCSS.7.RP.A.2C

Select ALL statements that support these two ratios being proportional.

• Both cross-products are 216.

• The cross-products are 96 and 486.

• The cross-products are 144 and 324.

• The simplified ratios are 4/6 and 6/9.

• The simplified ratios are both 2/3.

Tags

CCSS.7.RP.A.2A

Select ALL statements that support these two ratios being NOT proportional.

• Both cross-products are 20.

• The cross-products are 10 and 40.

• The cross-products are 8 and 50.

• The simplified ratios are 1/5 and 4/5.

• The simplified ratios are both 4/5.

Tags

CCSS.7.RP.A.2A

Select ALL statements that support these two ratios being proportional.

• Both cross-products are 400.

• The cross-products are 160 and 1000.

• The cross-products are 250 and 640.

• The simplified ratios are 5/8 and 25/40.

• The simplified ratios are both 5/8.

Tags

CCSS.7.RP.A.2A

Select ALL statements that support these two ratios being proportional.

• Both cross-products are 3960.

• The cross-products are 2640 and 5940.

• The cross-products are 2904 and 5400.

• The simplified ratios are 22/30 and 33/45.

• The simplified ratios are both 11/15.

Tags

CCSS.7.RP.A.2A

Select ALL statements that support these two ratios being NOT proportional.

• Both cross-products are 24.

• The cross-products are 18 and 32.

• The cross-products are 12 and 48.

• The simplified ratios are 3/8 and 2/3.

• The simplified ratios are both 2/3.

Tags

CCSS.6.RP.A.3A

Are the two ratios proportional?

• YES
• NO

Tags

CCSS.7.RP.A.2A

Are the two ratios proportional?

• YES
• NO

Tags

CCSS.7.RP.A.2A