1. RATIOS
write ratios in 3 forms

2. Warm-Up Convert each fraction to a decimal.
Convert each decimal to a fraction.
0.1
0.65
30 centimeters = _____ millimeters

3. Vocab
Ratio:
Compare using Division
All fractions are ratios

4. Writing Ratios 5 to 8 ratios can be written 3 ways
Always Simplify (Reduce)
5 to 8

5. Let’s compare the # of Boys to the # of girls in this class
Click
A if you’re a girl
B if you’re a boy
Let’s compare the # of Boys
to the # of girls in this class
Girls to Boys
Girls to the Total # of kids
Boys to the Total

6. Exit Problems
Simplify the ratio 12 : 8 and write the ratio in all three forms.
Nine out of 15 soccer players wore headbands on the field.
Write the ratio of soccer players who wore headbands to total soccer players.
Write the ratio of soccer players who did not wear headbands to total soccer players.
Write the ratio of soccer players who wore headbands to those who did not wear headbands.

7. Communication Prompt What has a ratio of 1 : 1 in your life?

8. Example 3b Every day after school Kay and Trudy talk on their cell
phones to each other. Write a ratio comparing the amount
of time Kay spoke to the amount of time Trudy spoke
during each conversation.
On Tuesday, Kay spoke for 30 minutes and Trudy spoke
for 1 hour
1 hour = 60 minutes

9. Example 3a
Every day after school Kay and Trudy talk on their cell phones to each other. Write a ratio comparing the amount of time Kay spoke to the amount of time Trudy spoke during each conversation. On Monday, Kay spoke for 45 minutes and Trudy spoke for 30 minutes

10. Example 1
Write a ratio each of three ways comparing: a. Julius’ number of green jelly beans to his total number of jelly beans. b. Luke’s number of green jelly beans to his total number of jelly beans. Fraction Colon “To” a. 1 : 4 1 to 4 b. 1 : 3 1 to 3

11. Example 2 Write a ratio for the number of red jelly beans Julius
grabbed to the number of red jelly means Luke grabbed.
Write a ratio as a fraction and simplify.
This ratio can also be written 2 : 1 or 2 to 1.