Proportional Cross Products

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.

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.

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

How do we find cross-products?

• Multiply the ratios diagonally.

• Multiply the ratios horizontally.

• Multiply the ratios vertically.

• Multiply the ratios curvilinear-ly.

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

• the two ratios are NOT proportional.

• the two ratios are proportional

What would the new equation be after using cross multiplication?

• q = 2

• q = 9

If the cross products are equal, then...

• The two ratios are not proportional.

• The two ratios are proportional.

Proportions are equal when...

• when the ratio is different

• when the cross products are equal

• when the numerators and denominators are equal straight across

• None of the above

Cross Products of a proportion are _________ equal.

• ALWAYS

• SOMETIMES

• RARELY

• NEVER

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.