Solving Proportional Relationships With Equations A

Are they equivalent? Check using cross products. Which equation correctly shows your work?

 $\frac{3}{6}=\frac{2}{4}$  

• 3 x 4 = 6 x 2

• 3  x 2 = 6 x 4

• 3 + 4 = 6 + 2

• 3  + 2 = 6 + 4

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What number do you get when you multiply the cross products? 
$$\frac{3}{6}=\frac{2}{4}  

• 6

• 5

• 12

• 10

Tags

CCSS.5.NF.B.5B

 $\frac{2}{6}\ =\ \frac{5}{15}$  

Determine if the following are equivalent using cross products. Which equation would show the correct work? 

• 2 x 5 = 6 x 15

• 2 x 15 = 6 x 5 

• 15-5 = 6-2

• 2 + 15 = 6 + 5

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

 $\frac{2}{6}\ =\frac{5}{15}$  

What number do you get when you multiply the cross products?

• 17

• 11

• 20

• 30

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B

 $\frac{9}{27}\ =\frac{y}{12}$  

Solve for y using cross multiplication. Which of the following would represent step 1 of the work needed to solve? 

• 27 +  y = 9 + 12

•  $27\cdot y=9\cdot12$  

 $\frac{9}{27}\ =\frac{y}{12}$  

Solve for y using cross multiplication. Which of the following would represent step 2 of the work needed to solve? 

• 27y = 20

•  $27y=108$  

 $\frac{9}{27}\ =\frac{y}{12}$  

Solve for y using cross multiplication. 

• y = 4

•  $y=3$  

Tags

CCSS.7.RP.A.3

 $\frac{2}{8}\ =\frac{y}{28}$  

Solve for y using cross multiplication. Which of the following would represent step 1 of the work needed to solve? 

• 28 +  y = 2 + 8

•  $8\cdot y=2\cdot28$  

•  $2\ \cdot\ y=8\cdot28$  

 $\frac{2}{8}\ =\frac{y}{28}$  

Solve for y using cross multiplication. Which of the following would represent step 2 of the work needed to solve? 

• 8y = 56

•  $8y=30$  

•  $8y=14$  

 $\frac{2}{8}\ =\frac{y}{28}$  

Solve for y using cross multiplication. 

• y = 7

•  $y=8$  

•  $y=14$