Determining Proportions with Cross Multiplication

What is a proportion?

• A comparison of two numbers

• A statement that two ratios are equal

• A method of addition

• A type of fraction

Tags

CCSS.7.RP.A.2A

What is the first step in determining if two ratios form a proportion using cross multiplication?

• Subtract the ratios

• Add the ratios

• Divide the ratios

• Set the ratios up in fractional form

Tags

CCSS.7.RP.A.2A

In Example 1, what are the two ratios being compared?

• 10:6 and 15:9

• 8:3 and 11:7

• 6:10 and 9:15

• 3:8 and 7:11

Tags

CCSS.6.RP.A.3A

What is the result of 8 times 7 in Example 1?

• 33

• 56

• 88

• 77

Tags

CCSS.3.OA.C.7

What is the result of 3 times 11 in Example 1?

• 56

• 33

• 88

• 77

Tags

CCSS.3.NBT.A.3

Are the ratios 8:3 and 11:7 proportional?

• Yes

• No

• Cannot be determined

• Sometimes

Tags

CCSS.7.RP.A.2A

In Example 2, what are the two ratios being compared?

• 8:3 and 11:7

• 6:10 and 9:15

• 3:8 and 7:11

• 10:6 and 15:9

Tags

CCSS.6.RP.A.3A

What is the result of 6 times 15 in Example 2?

• 45

• 90

• 60

• 75

Tags

CCSS.4.NBT.B.5

What is the result of 10 times 9 in Example 2?

• 45

• 75

• 90

• 60

Tags

CCSS.3.NBT.A.3

Are the ratios 6:10 and 9:15 proportional?

• No

• Cannot be determined

• Sometimes

• Yes

Tags

CCSS.6.RP.A.3A