Geo: 6.1 Ratios & Proportions

Front

What is a ratio?

Back

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

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 ratio?

Back

To set up a ratio, write the two quantities being compared as a fraction, with one quantity in the numerator and the other in the denominator.

Front

If a recipe serves 15 people and requires 2 gallons of punch, how much punch is needed for 60 people?

Back

8 gallons of punch.

Front

How do you find the total number of items based on a ratio?

Back

Use the known quantity and the ratio to set up a proportion and solve for the unknown total.

Front

If Orlando makes a quarter for every dozen envelopes stuffed, how many envelopes must he stuff to earn $10.00?

Back

480 envelopes.

Front

What is the relationship between the number of muffins and the amount of flour in a recipe?

Back

The number of muffins is directly proportional to the amount of flour used.

Front

If 600 g of flour makes 2.5 dozen muffins, how many muffins can be made with 900 g of flour?

Back

45 muffins.

Front

How do you predict the total number of defective items based on a sample?

Back

Set up a ratio using the number of defective items in the sample and the total items in the sample, then use it to estimate the total defective items in the larger group.

Front

Cindy checks 420 printers and finds 3 defective in 84. How many total defective printers can she predict?

Back

15 defective printers.