Ratios

Ratios

A ratio is the relationship between the quantity of two or more items.

Module 1, Topic A, Lesson 1

STANDARD: 6.RP.A.1
RIGOR: Conceptual Understanding
OBJECTIVE: SWBAT understand ratio as an ordered pair of number in order to describe the relationship between the quantity of 2 things in real world scenario

Ratio

• Ratio notation A:B or A to B

• Ratio Language: for every, as many as,  for each, such as to 

• Note: The two numbers being compared can not both be zero

Practice (I Do)

The ratio of red ball to blue balls is 1 to 4.
                                     or

For every red ball there are 4 blue balls

The ratio is 1 to 4 or 1:4

We Do

What is the ratio of apples to pears?

what is the ratio of pears to apples?

what is the ratio of apples to fruits ?

what is the ratio of pears to apples?

We do (Collaborate)

The coed soccer team has four times as many boys on it as it has girls. We say the ratio of the number of boys to the number of girls on the team is 𝟒: 𝟏. We read this as four to one.

what are the total possible number of boys and girls on the team?

Multiple Choice

CFU

Dana love rocks, she has 6 pieces of granite, 3 pieces of marble, and 14 pieces of sandstone.

what is the ratio of the pieces of marble to sandstone in Dana's collection?

• 3 to 14

• 14 to 3

• 3 : 6

• 6 : 3