Ratios
A comparison between two numbers is called a______
ratio
What is a unit rate?
When rates are expressed as a ratio with a denominator of 1, such as 5 miles per 1 hour, the rate is a UNIT RATE.
How can you tell if two ratios make a proportion?
The cross products [or means & extremes] must be equal.
What's the value of the ratio?
4/6 : 6/9
36/36 = 1
Solve for x
x+6 = 12
x = 6
What are the 3 ways a ratio can be written?
A ratio can be written like a fraction, with a colon :, or with the word "to".
If Michael types 120 words in 3 minutes, what is his unit rate for typing?
He types 40 words per minute.
Are the ratios 1/6 and 2/7 proportional?
No, the ratios are not proportional.
1 x 7 = 7 and 2 x 6 = 12
Is it equivalent?
3/2 = 9/6
18 = 18
Yes
Write the statement.
x plus 9 is greater than or equal to five
x + 9 > 5
Write 6 girls to 8 boys as a ratio.
6/8 or 6 to 8 or 6:8
If 10 bags of Hot Cheetos cost $3.50, then how much does 1 bag cost?
One bag cost $0.35.
Are the ratios 6/8 and 9/12 proportional?
Yes, the ratios are proportional.
6 x 12 = 72 and 9 x 8 = 72
3/6 = 8/12
36 is not equal to 48
No
Solve for y.
10 / y = 5
y = 50
What is the value of the ratio for comparing 10 limes to 6 lemons?
5:3 or 5/3 or 5 to 3
Mimi drives 50 miles in 2 hours. What is her unit rate (speed per hour)?
25 miles per hour
Are the ratios 5/10 and 4/8 proportional?
Yes, the ratios are proportional.
5 x 8 = 40 and 10 x 4 = 40
What's the value of the ratio?
6/10 : 7/10
60/70 = 6/7
You have 6 gummies and 25 smarties. Wrote a ratio to compare smarties to total candy.
25 to 31
Which is the better deal ....
$20 for 5 t-shirts or $24 for 8 t-shirts
$24 for 8 t-shirts (unit rate is $3 per shirt)
Are the ratios 12/20 and 3/10 proportional?
No, the ratios are not proportional.
12 x 10 = 120 and 20 x 3 = 60
Is it equivalent?
5/7 = 7/11.2
56 does not equal 49
No
Solve for g.
g + 10 - 2 = 14