1. Original Test Question A
Determine which pair of ratios does NOT form a proportion. A) B)
and C)
and D.
and
and
Method 2: Convert each
ratio to a decimal. Both ratios
will equal the same decimal
value if they form a proportion.
For example:
30/75= and 8/20 = .4 So
does form a proportion.
Method 1: Check the
cross products. Cross
products of proportions are
always equal.
For example:
30(20)=600 and 8(75)=600 So
does form a proportion.

2. Do the following pairs of ratios form proportions?
Now try these!
Do the following pairs of ratios form proportions?
9(20)=180 and 6(27)=162
So they do not form a proportion
12(3)=36 and 8(4.5)=36
So they do form a proportion

3. Original Test Question B
Use a proportion to determine whether or not the two candy
bars below contain an equal proportion of sugar.
Snickers: A 59 gram candy bar contains 30 grams of sugar.
Milky Way: A 72 gram candy bar contains 35 grams of sugar.
Since the cross products are not equal the bars do not
Contain an equal proportion of sugar!

4. Now try this!
Use a proportion to determine whether or not the two bags
of potato chips below contain an equal proportion of carbs.
Lays: A 40 gram bag contains 14 grams of carbs.
Ruffles: A 60 gram bag contains 21 grams of carbs.
Since the cross products are equal the bags
contain an equal proportion of carbs!

5. Original Test Question C
A 12 ounce can of Coke costs $0.75 when purchased from the soda
machine at the school. An 18 ounce bottle of Pepsi from the soda
machine at the local gas station costs $ Find the unit cost of each
to determine which location has the less expensive soda per ounce?
Coke
Pepsi
Coke is the better deal because
it is $.01 cheaper per ounce

6. Now try this! A 20 ounce bag of potato chips costs $3.99 at the store.
The same brand of chips costs $.50 for 3 oz
in the vending machine.
Find the unit price for each ounce and determine
the better deal.
Store
Vend
The vending machine has the better deal
because those chips cost 3 cents more
per ounce.

7. Original Test Question D
The ratio of teachers to students in the gym is 2 to 9. How many
teachers are in the gym if there is a total of 165 students and teachers
altogether in the gym?
The problem tells you that in the ratio there are 2 teachers
To every 9 students. Next, it gives you the total number of
165. This means you need the total in the ratio of 9+2=11

8. Now try this!
The ratio of fish to snails in an aquarium is 4 to 5. How many
fish are in the aquarium if there is a total of 117 fish and snails
altogether in the aquarium?

9. Original Test Question E
Which ratio is equivalent to ?
You can simplify each ratio or change
each ratio to a decimal to compare.
Both and simplify to or .75 so they are equivalent

10. Now try this! You can simplify each ratio or change
Which ratio is equivalent to ?
You can simplify each ratio or change
each ratio to a decimal to compare.
Both and simplify to or .4 so they are equivalent