1/20 is 5% because half of 10% is 5% and half of 1/10 is 1/20. Also, 5*20=100. Learnist Board: http://bit.ly/13AGhZq More information at http://bit.ly/ZXLw0I #P22

1. 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%

2. 0%
10% 20%
5%
15%
4
20
1
20
2
20
1
10
3
20
100%
105%
1
5
21
20
20
20

3. 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%

4. 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

5. 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

6. 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

7. Closing Notes
 Remember 

8. 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%