Equivalent Ratios Cross Product

Which ratio is equivalent to 5 to 4

• 10 to 12

• 25 to 20

• 15 to 8

• 4 to 5

Mrs. Shelly paid $3 for 6 muffins and Mrs. Kloske paid $9 for 18 muffins.

• yes, equivalent

• no, not equivalent

When determining whether Proportions are Equal, we need to do which of the following?

• addition

• multiplying straight across

• cross multiplication

• Dividing

For a recipe, Brutus uses 4 cups of sugar for every 5 cups of flour. Which of the following show equivalent ratios for sugar to flour?

• 4/5=8/10 =12/15

• 4/5 = 5/6 = 6/7

• 4/5=8/15=16/45

• 4/5 = 3/4 = 2/3

What is the missing value of the proportion shown here?

• x = 16.5

• x = 17

• x = 17.5

• x = 18

Use cross products to determine if these ratios are proportional:
2/3 = 10/15

• no

• yes

Are these two ratios equivalent?

• Yes

• No

If the Cross Products are equal, then..................

• the two ratios are NOT proportional.

• the two ratios are proportional

What is the correct next step when using the cross product method on this problem?

• 1(10) = 2(5)

• 1(5) = 2(10)

• 1(2) = 5(10)

Cross Products of a proportion are _________ equal.

• ALWAYS

• SOMETIMES

• RARELY

• NEVER