Proportions

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

How do you simplify a ratio?

Back

To simplify a ratio, divide both terms by their greatest common divisor (GCD).

Front

What does it mean for two ratios to be proportional?

Back

Two ratios are proportional if their cross products are equal.

Front

If 8 apples are to 24 oranges, what is the simplest form of this ratio?

Back

1/3

Front

If 13 out of 20 homes have a computer, how many computers would be expected in 60 homes?

Back

39 Computers

Front

If Mrs. Setzer buys 3 boxes of cookies for $15, how much would 10 boxes cost?

Back

$50

Front

What is the formula to find the unit rate?

Back

The unit rate is found by dividing the quantity by the number of units, expressed as 'quantity per unit'.

Front

If Alice earns $20.40 in 3 hours, how much will she earn in 8 hours?

Back

$54.40

Front

What is the cross product of two ratios a/b and c/d?

Back

The cross product is ad and bc; if ad = bc, the ratios are proportional.

Front

How do you find a missing value in a proportion?

Back

Set up the proportion as a fraction and cross-multiply to solve for the missing value.