1. Percent and Estimation

2. The table shows common percents and their fraction equivalents
The table shows common percents and their fraction equivalents. You can use fractions to estimate the percent of a number by choosing a fraction that is close to a given percent.
Percent
Fraction
20%
33 % 1 3
66 % 2 3
10%
25%
50%
75% 1 10 1 5 1 4 1 3 1 2 2 3 3 4
Divide by 10
Divide by 5
Divide by 4
Divide by 3
Divide by 2
Divide by 3, multiply by 2
Divide by 4, multiply by 3

3. Remember:”Of” means to multiply
EX 1)
Use a fraction to estimate 27% of 63.
27% X 63 
Round 27% to a percent that is easy to change to a fraction like 25% . 1 4
25% X 63 
X 63 1 4
X 64
Change 63 to a number that will be easily simplified by the fraction. 
 16
Multiply.
27% of 63 is about 16.

4. Estimate percents by figuring 10%. Use mental math.
EX 2)
Estimate 38% of 91.
Round 38% to 40% and 91 to 90.
40% of 90
Find 10% of 90
= 9
Since there are 4 – 10% in 40%, multiply by 4
9 X 4 = 36
38% X 91 ≈ 36.
38% of 91 is about 36.
EX 3)
Estimate ½ % of 240.
EX 4)
Estimate 5% of 70.
10% of 240 = 24
10% of 70 = 7
1% of 240 = 2.4
5% of 70 = 3.5
½ % of 240 = 1.2

5. Assignment
Page 231
Problems 2-10 evens

6. Notes start here

7. Percent and Estimation
Date _______________
Percent and Estimation

8. The table shows common percents and their fraction equivalents
The table shows common percents and their fraction equivalents. You can use fractions to estimate the percent of a number by choosing a fraction that is close to a given percent.
Percent
Fraction

9. Remember:”Of” means to multiply
EX 1)
Use a fraction to estimate
Round 27% to a percent that is easy to change to a fraction like ____ .
Change 63 to a number that will be easily simplified by the fraction.
Multiply.

10. Estimate percents by figuring 10%. Use mental math.
EX 2)
Round 38% to ____ and 91 to ____
Since there are 4 – 10% in 40%, multiply by __
EX 3)
EX 4)