#### Transcript of Lesson 12: From Ratio Tables to Double Number Lines

**Lesson 12: From Ratio Tables to Double Number Lines**

**Ratios**

Exercise 2

The amount of sugary beverages Americans consume is a leading health concern. For a given brand of cola, a 12-ounce

serving of cola contains about 40 grams of sugar. Complete the ratio table, using the given ratio to find equivalent

ratios.

Exercise 3

A 1-liter bottle of cola contains approximately 34 fluid ounces. How many grams of sugar would be in a 1-liter bottle of the cola? Explain and show how to arrive at the solution.

Use a double number line

A school cafeteria has a restriction on the amount of sugary drinks available to students. Drinks may not have more than 25 grams of sugar. Based on this restriction, what is the largest size cola (in ounces) the cafeteria can offer to students?

Lesson Summary

Double Number Line Diagram: a tool used for understanding the equivalence of two related numbers. It is called

“double” because each mark on the line has two numbers matched to it. The top row of numbers describes the

whole represented by the line in one way, and the bottom row describes the whole represented by the line in

another way. Because the whole line is the same, it is possible to see the equivalences between the rows of

numbers at any point on the line

Is coke healthy?

Answer

Cola (ounces) 6 12 18

Sugar 20 40 60

Cola (ounces) ___ 12 ____

Sugar (grams) _____ 40 ____

Cola (ounces) 6 12 18 ____ ____

Sugar (grams) 20 40 60 _____ _____

Extend the table

Cola (ounces) 6 12 18 30 36

Sugar (grams) 20 40 60 100 120

What happens if you extend the table and the

number you want is not there?

Double number line

Four-square time!!!

Make a double number line

Use page 40 to help you

Cola (ounces) 18 30 36

Sugar (grams) 60 100 120

How many marks is between each number?

Double Number Line

0 6 12 18

0 20 40 60

Problem set

Choose one or two to do.

Problem Set One

1. While shopping, Kyla found a dress that she would really like, but it costs $52.25 more than she has. Kyla charges

$5.50 an hour for babysitting. She wants to figure out how many hours she must babysit to earn $52.25 to buy the

dress. Use a double number line to support your answer.

Babysit 5.50 11 16.50 22 27.5 33 38.5 44 49.5 55

Hours 1 2 3 4 5 6 7 8 9 10

Exit Ticket

Remeber how you will be graded on your exit ticket. Use your rubric.

**What have we learned so far**

about ratios?

Full transcript