Lesson 3.1 Ratio

Lesson 3.1 - Ratios

​New Vocabulary

​Ratio - a comparison of two quantities. Ratios can be part-to-part, part-to-whole, or whole-to-part comparisons.

​The ratio a : b indicates that there are a  units of the first quantity for every b units of the second quantity.

​Examples:

• 2 cats to 6 dogs

• 1 cat for every 3 dogs

• 3 dogs for each cat

• 3 dogs out of every 4 pets

• 2 cats out of 8 pets

The ratio of a to b can be written as a : b

​Example 1

1. Write the ratio of pennies to quarters.

2. Write the ratio of quarters to dimes.

3. Write the ratio of dimes to the total number of coins.​

Fill in the Blank

Write the ratio of frogs to turtles.

Fill in the Blank

Write the ratio of basketballs to soccer balls.

Fill in the Blank

Write the ratio of calculators to pencils.

Fill in the Blank

Write the ratio of shirts to pants.