1. Name ____________________________________ Date __________________
Mrs. Labuski / Mrs. Rooney Period __________ Lesson 8-1 Ratios & Rates
VOCABULARY DEFINITION EXAMPLE
A comparison of two
RATIO quantities by division. See below
Can be written three ways.
Let’s compare the number of boys in the class to the number of girls in the class and
write it as a ratio. First find each quantity.
Number Number
of boys of girls
11 9
Then write the comparison as a ratio, using the quantities in the same order as
they appear in the word expression. There are three ways to write a ratio.
Written as a fraction Written with a colon Written with words
11
11:9 11 to 9
9
Now you try:
Ratio Written as a Written with Written with
fraction a colon words
1. lions to 9 3 9:12 9 to 12
elephants 12 4 3:4 3 to 4
2. giraffes to 8 1 8:16 8 to 16
otters 16 2 1:2 1 to 2
3. lions to 9
9:10 9 to 10
seals 10
4. seals to 10 5 10:12 10 to 12
elephants 12 6 5:6 5 to 6
5. elephants 12 4 12:9 12 to 9
to lions 9 3 4:3 4 to 3
2. VOCABULARY DEFINITION EXAMPLE
A comparison of two quantities that
RATE have different units
of measure.
When the comparison is to one unit.
UNIT RATE
Which bottle of detergent would be cheaper? It’s easier to compare when you
know the unit rate.
5 dollars 10 dollars
20 ounces 90 ounces
$10 .25 .11
20)5.00 90)10.0
$5
0.25 dollars 0.11 dollars
90oz. 1 ounce 1 ounce
20oz.
It is a better ‘deal’ to purchase the $10 bottle.
When the second term of a rate is 1 unit, the rate is a unit rate.
To write as a unit rate, divide each term by 3.
150 miles ÷ 3 hours = 50 miles
3 hours ÷ 3 hours = 1 hour
The unit rate is .
Now you try:
6
. 9.
7. 10.
8.
3. Name ____________________________________ Date __________________
Mrs. Labuski / Mrs. Rooney Period __________ Lesson 8-1 Ratios & Rates
VOCABULARY DEFINITION EXAMPLE
RATIO See below
Let’s compare the number of boys in the class to the number of girls in the class and
write it as a ratio. First find each quantity.
Number Number
of boys of girls
Then write the comparison as a ratio, using the quantities in the same order as
they appear in the word expression. There are three ways to write a ratio.
Written as a fraction Written with a colon Written with words
Now you try:
Ratio Written as a Written with Written with
fraction a colon words
1. lions to
elephants
2. giraffes to
otters
3. lions to
seals
4. seals to
elephants
5. elephants
to lions
4. VOCABULARY DEFINITION EXAMPLE
RATE
UNIT RATE
Which bottle of detergent would be cheaper? It’s easier to compare when you
know the unit rate.
$10
$5
90oz.
20oz.
When the second term of a rate is 1 unit, the rate is a unit rate.
To write as a unit rate, divide each term by 3.
150 miles ÷ 3 hours = 50 miles
3 hours ÷ 3 hours = 1 hour
The unit rate is .
Now you try:
6. 9.
7. 10.
8.
