Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
Unit 3
Chapter 5
Percents
January 12, 2015
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
January 12, 2015
Unit 3
Chapter 5 Section 1
Percents, Fractions and Decimals
Objective: To convert between fractions, decimals and percents
This product has 0.5g of fat.
Percent(%): a ratio that compares a number to 100
Fraction
21
100
Decimal
0.21
Percent
21%
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
Examples:
Multiply by 100
Decimals to percents
1) Write each decimal as a percent.
OR
Move the decimal two places to the right
a) 0.759
b) 0.003
c) 5.187
Percent to decimals.
2) Write each percent as a decimal.
a) 47.5 %
Divide by 100
b) 0.06 %
OR
Move the decimal two places to the left
c) 2500%
Fraction to percents.
3) Write each fraction as a percent.
a) 17
20
Rewrite with a denominator of 100
OR
Convert to a decimal and write as a percent
b) 3
9
c) 21
40
Percent to fractions.
4) Write each percent as a fraction.
a) 125 %
b) 3.6 %
c) 0.02%
Rewrite with a denominator of 100 and simplify
January 12, 2015
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
January 12, 2015
Application:
5) In a slice of cheese pizza, 45 calories are from fat. The total number of calories in each slice is 158. About what percent of the calories are not from fat? Round to the nearest tenth of a percent.
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
January 12, 2015
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
January 12, 2015
Bell Ringer­
6a) Behavioral scientists observed an elephant that slept about 12.5% of each day. What fraction of each day did the elephant sleep?
6b) An elephant eats about 6% of its body weight in vegetation each day. Write this as a fraction in simplest form.
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
January 12, 2015
Challenge
Your teacher uses different methods of grading quizzes. Your quiz 9 16
21
grades are 85%, , , 92%, , and 79%.
10 20
25
a. Write your quiz grades in order from least to greatest.
b. Find the average percent grade of your quizzes.
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
Writing in Math
Does 0.4 equal 0.4%? Explain.
January 12, 2015
Unit 3 Chapter 5 Section 1 Percents Fractions and Decimals.notebook
Homework
Practice Worksheet 5­1
January 12, 2015