
On a map, 1 cm represents 3.27 km. It is
24.5 cm between two cities on this map.
What is the actual distance between the two
cities?
1𝑐𝑚
24.5𝑐𝑚
=
3.27𝑘𝑚
𝑥 𝑘𝑚
1x = 80.115 km
The ratio of a number to 100
 “percent” means per one hundred
 Symbol is %

To solve problems with percent, we
need to change the percent to a
decimal
 Move the decimal place 2 spaces to
the LEFT
 If there is no decimal it is always at
the end!!

Write as a decimal.
35%
0.35
5%
0.05
138%
1.38
0.8%
0.008
First, change the fraction to a
decimal
 Move the decimal place 2 spaces to
the RIGHT to make the decimal a
percent

Write as a percent.
-
2
3
5
4
0.67
67%
- 1.25
-125%
Write as a percent.
-
3
4
3
8
0.75
75%
- 0.375
- 37.5%
15.5% of 60 is what number?
0.155 ∙ 60 =
9.3 = n
n
24 is what percent of 120?
24 =
p
24 = 120 p
120 120
0.2 = p
20% = p
∙
120
25% of what number is 15?
.25 ∙
.25 n = 15
.25
.25
n = 60
n
= 15



Write ratio (fraction)
ℎ𝑜𝑤 𝑚𝑎𝑛𝑦
as
𝑇𝑜𝑡𝑎𝑙
Change fraction to a decimal by dividing
Move the decimal two places to the RIGHT
On a test of 25 items, a student got
19 correct. What percent were
correct?
19
= 0.76
25
76%
A baseball player had 12 hits in 20
times at bat. What percent of his
times at bat resulted in a hit?
12
= 0.6
20
60%
The sales tax rate in PA is 6%.
a.
How much tax would be charged on a
purchase of $300.00?
Change 6% to a decimal :
0.06
Multiply cost by tax:
$300.00 ∙ 0.06 = $18.00
b.
What would be the total cost of the purchase?
Add cost of item and the tax:
$300.00 + 18. 00 = $318. 00

Pg. 156 #’s 1 – 30 even; 37 and 38