Ratio Flashcard 1

Front

What is a scale factor in the context of enlarging an image?

Back

A scale factor is a number that scales, or multiplies, some quantity. In the context of enlarging an image, it is the ratio of the new size to the original size.

Front

How do you simplify a ratio?

Back

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

Front

What is the ratio of red marbles to total marbles if there are 10 red and 15 green marbles?

Back

The ratio of red marbles to total marbles is 2:5.

Front

If a photo is enlarged from 4 inches to 12 inches, what is the scale factor?

Back

The scale factor is 3.

Front

How do you calculate the total number of items in a ratio problem?

Back

To calculate the total number of items, add the quantities of each part of the ratio together.

Front

If Zeke reads 100 pages in 2 hours, how do you find the time to read 300 pages?

Back

Use the unit rate: if Zeke reads 50 pages per hour, then for 300 pages, it will take 6 hours.

Front

What is the cost of 20 books if 5 books cost $25?

Back

The cost of 20 books would be $100.

Front

What does it mean to express a ratio in simplest form?

Back

Expressing a ratio in simplest form means reducing it to the smallest whole numbers that maintain the same relationship.

Front

How do you find the greatest common divisor (GCD) of two numbers?

Back

The GCD can be found by listing the factors of each number and identifying the largest factor they have in common.

Front

What is the simplified form of the ratio 16:20?

Back

The simplified form of the ratio 16:20 is 4:5.