proportion models. fold your graph paper into thirds

Proportion Models

Fold your graph paper into thirds

Label itShorts and pants

Chocolate chip and sugar cookies

Cats and pets

In Mrs. Durfee’s class, the ratio of students wearing shorts to students wearing pants is 1 to 3

Draw a model

In Mr. Prince’s class, the ratio of students wearing shorts to students wearing pants is 4 to 12

Draw a model

Compare the two models

Each model has 4 boxesEach box has the same amount of items

The ratios are proportional (equivalent)

=

In one box of cookies, the ratio of chocolate chips cookies to sugar cookies is 3 to 8

Draw a model

A bigger box of cookies has the ratio of 12 to 32 chocolate chips cookies to sugar cookies

Draw a model

Each model has 11 boxesEach box has the same amount of items

=

The ratio of cats to total pets at PetCo is 3 to 9. PetSmart’s ratio of cats to total pets is

6 to 18

Draw a model

The ratio of cats to total pets at PetCo is 3 to 9

PetSmart’s ratio of cats to total pets is 6 to 18

They are proportional

3 to 9

6 to 18

Same number of boxes

Equal amount of items in each box