Christmas Light Ratios

Front

What is a ratio?

Back

A ratio is a relationship between two numbers that shows how many times the first number contains the second.

Front

How do you write a ratio?

Back

Ratios can be written in three ways: using a colon (e.g., 2:3), as a fraction (e.g., 2/3), or with the word 'to' (e.g., 2 to 3).

Front

What does the ratio 2:3 mean in terms of red and blue bulbs?

Back

It means for every 2 red bulbs, there are 3 blue bulbs.

Front

If there are 10 red bulbs, how many blue bulbs are there if the ratio is 2:3?

Back

There would be 15 blue bulbs.

Front

How do you find the total number of bulbs given a ratio?

Back

Add the parts of the ratio together and multiply by the number of bulbs of one color.

Front

If the ratio of blue to red is 3:2, how many red bulbs are there if there are 12 blue bulbs?

Back

There would be 8 red bulbs.

Front

What is the ratio of blue to green to red if it is 4:2:3?

Back

For every 4 blue bulbs, there are 2 green bulbs and 3 red bulbs.

Front

How do you simplify a ratio?

Back

Divide both sides of the ratio by the greatest common factor.

Front

What is the greatest common factor of 4 and 2?

Back

The greatest common factor is 2.

Front

If the ratio of red to blue is 2:3, what is the ratio of blue to red?

Back

The ratio of blue to red is 3:2.