Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you set up a proportion?

Back

To set up a proportion, you can use the formula a/b = c/d, where a and b are the first ratio, and c and d are the second ratio.

Front

What is the cross-multiplication method?

Back

Cross-multiplication is a method used to solve proportions by multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 4 sunfish are to 3 perch, how do you find the number of perch for 300 sunfish?

Back

Set up the proportion: 4/3 = 300/x, then cross-multiply to find x.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per one unit.

Front

How do you find the unit rate from a ratio?

Back

To find the unit rate, divide both terms of the ratio by the second term.

Front

If a grading machine can grade 48 tests in 1 minute, how many tests can it grade in 6 minutes?

Back

It can grade 48 tests/minute * 6 minutes = 288 tests.

Front

What is the formula for finding the total cost based on a unit cost?

Back

Total Cost = Unit Cost x Number of Units.

Front

If refreshments cost $9.50 for 10 guests, how much does it cost per guest?

Back

Cost per guest = $9.50 / 10 = $0.95.

Front

How do you calculate the cost for 80 guests if it costs $9.50 for 10 guests?

Back

Use the unit cost: $0.95 per guest x 80 guests = $76.