Five Percent is One-Twentieth

5% is 1/20
 1/20 is 5% because half of 10% is 5%
and half of 1/10 is 1/20
 5*20=100.
1
20

5%

0%

10% 20%
5%
15%

4
20

1
20
2
20

1
10

3
20

100%
105%

1
5

21
20
20
20

Find the percent
1. 7 out of 20 is what percent?

7
20

7 5%

2. 30 = ___% of 200

30
200

3
20

15%

35%

Recall the strategy:
To find A% of B
You can change the percent to a fraction,
Find B divided by the bottom, then
Multiply by the top.

Find 15% of $40
15% of 40

3
40
20

40
3 2 3 6
20

Find the number
1. Find 5% of 180.

1
of 180 (180 20)
20

9

2. Find 105% of 80.
1
105% of 80 100% of 80 +
80 80 4 84
20

3. Find 65% of 400.
13
65% of 400=
of 400
20

400
*13 20*13 260
20

Examples:

1. If 5% of the students played a sport and there are
12,000 students, how many played a sport?
1
12,000
of 12,000
600
20
20
2. The bag of dog food has 15% more FREE. Normally
the bag has 40 lbs. How much is in the bag with the
special offer?
115% of 40 100% of 40 15% of 40

3. If the restaurant bill is
$42.60 and you want to
tip 15%, what is the tip?

40 6

46 pounds

10% of 42.60 5% of 42.60
4.26 2.13
$6.39

Closing Notes
 Remember 

Recap

1/2

50 %

1/3

33⅓ %

1/4

25 %
20 %

1/6

16⅔ %

1/7

14 % *

1/8

12½ %

1/9

11% *

1/10
* approximate

Percent

1/5

Here are the percents
we know:

Fraction

10 %

1/20

5%

Five Percent is One-Twentieth

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Five Percent is One-Twentieth