Writing Ratios

Writing Ratios

What is a ratio?

• One way to compare numbers

• Example: Eight of the 35 instruments are trumpets. The ratio of trumpets to total instruments is 8 to 35.

Fill in the Blank

A ratio is one way to __________ numbers.

Ratios can be written three ways

• with the word to - 8 to 35

• with a colon - 8:35

• as a fraction -  $\frac{8}{35}$  

Multiple Select

Select all of the ways a ratio can be written:

• with the word to

• as a decimal

• with a colon

• as a fraction

Writing Ratios Continued

You must write the ratio in the order it is in the problem. If the problem asks for the ratio of stars to hearts you have to keep the numbers in that order.
So if there are 2 stars and 5 hearts you would write the ratio of stars to hearts as

          2 to 5, 2:5, or $\frac{2}{5}$  

Multiple Choice

What is the ratio of triangles to squares?

• 3 to 9

• 9 to 3

Reading a Ratio

When you read a ratio you always read it as one number to another. Even when it is written with a colon or as a fraction.
6:11 is read as six to eleven

 $\frac{3}{1}$  is read as three to one

Open Ended

Any Questions, Comments, or Concerns about ratios so far?