Relate Fractions, Decimals, and Percents

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1 Domain 1 Lesson 1 Relate Fractions, Decimals, and Percents Common Core Standard: 7.RP.3 Getting the Idea Rational numbers are numbers that can be expressed in the form a, where a and b are b integers and b Þ 0. Fractions, decimals, and percents are rational numbers that can be used to show parts of a whole. Percent means per hundred. For example, 70% of a number means 70 times the quantity. The symbol for percent is %. 0 You can convert rational numbers to different forms. To convert a percent to a fraction, write the percent as the numerator over a denominator of 0. Then simplify the fraction using the greatest common factor (GCF). Example 1 Write 72% as a fraction in simplest form. Write the percent as a fraction with a denominator of 0. Simplify. Step 1 Step 2 Solution 72% 18 2 Remove the percent sign. Write the percent as the numerator and 0 as the denominator % 0 Simplify the fraction using the GCF. The GCF of 72 and 0 is 4. Divide the numerator and denominator by Example 2 What is 84% written as a decimal? Remove the percent sign and move the decimal point two places to the left. 84% Solution 84%

2 Example 3 What is 2 written as a decimal? Write an equivalent fraction with a denominator of. Step 1 Find a fraction equivalent to 2 that has a denominator of. Since 3 2, multiply the numerator and denominator by Step 2 Write the decimal equivalent of 4. 4 is read four tenths Solution Example 4 Write 0.6 as a fraction in simplest form. Write the digits after the decimal point as the numerator. The denominator is the place value of the last digit. Simplify. Step 1 Step 2 Solution Write the digits 6 as the numerator of the fraction. The denominator is 0 because the last digit,, is in the hundredths place Simplify using the GCF. The GCF of 6 and 0 is

3 To convert a decimal to a percent, multiply the decimal by 0 and insert a percent sign. Multiplying a decimal by 0 is the same as moving the decimal point 2 places to the right. Example What is 0.87 written as a percent? Multiply the decimal by 0. Move the decimal point two places to the right Insert a percent sign. 87.% Solution % Example 6 Write 16 as a percent. 2 Step 1 Step 2 Write an equivalent fraction. Percent means per hundred, so write an equivalent fraction with a denominator of , so multiply the numerator and denominator by Insert a percent sign next to the numerator % Solution 16 64% 2 18 Domain 1: The Number System

4 Lesson 1: Relate Fractions, Decimals, and Percents If the denominator is not a factor of 0, convert the fraction to a decimal. Then convert the decimal to a percent. Some decimals, such as 1, are repeating decimals. 3 To write a repeating decimal as a percent, write the percent and the part that repeats as a fraction. Example 7 What is 2 written as a percent? 3 Convert the fraction to a decimal. Then convert the decimal to a percent. Step 1 Divide the numerator by the denominator Step 2 Multiply the decimal by 0. Solution Insert a percent sign % or % % Coached Example Maria received % of the vote in a student council election. What decimal and fraction, written in simplest form, are equivalent to the percentage of the vote Maria received? To convert a percent to a decimal, remove the percent sign and move the decimal point 2 places to the. The decimal is equivalent to %. To convert a percent to a fraction, write the percent as the numerator over a denominator of. What is the GCF of the numerator and denominator? Divide the numerator and denominator by. Simplify. % written as a decimal is. % written as a fraction is. 19

5 Lesson Practice Choose the correct answer. 1. About 60.7% of eligible voters voted in the election. Which decimal is equivalent to 60.7%? A B C D Tomas correctly spelled 18 out of 20 words on his last spelling quiz. What decimal represents the portion of the words that Tomas spelled correctly? A B C. 0.8 D In a survey of patients, Dr. Molar found that 8% of his patients floss daily. Which fraction is equivalent to 8%? A. 4_ B. 2_ C. 4 2 D Kristen made _ 3 of her free throws for the 8 season. Which percent is equivalent to _ 3 8? A. 37.% B. 38% C. 38.% D. 37%. Which fraction is equivalent to 48%? A. 4_ B. 4_ 8 C D Sales at Cycle Time increased by 370% this year. Which of the following is equivalent to 370%? A B. 3.7 C D Domain 1: The Number System

6 Lesson 1: Relate Fractions, Decimals, and Percents 7. Which rational number is not equivalent to the others? A. 7% B. _ 3 4 C. 0.7 D Which of the following shows a set of equivalent rational numbers? A. 2_ 0.4 2% B. 2_ % C % D % 9. The Lions won 3 out of 40 games this season. A. What fraction of games played did the Lions win? Write your answer in simplest form. B. Write a decimal and a percent equivalent to the fraction of games the Lions won. Show your work.. Victor correctly answered 18 of the 20 questions on his math quiz. Circle the fraction that makes the statement true. 4 The fraction of questions that Victor answered correctly is

7 11. Which shows a set of equivalent rational numbers? Circle all that apply. A. 4_, 0.8, 80% B. _ 3 4, 0.7, 7% C. 3 _ 1, 0.3, 3% D. _ 8, 0.62, 6.2% 12. Draw a line from each fraction or decimal to its equivalent percent. A. 1_ 8 87.% B. 1_ 30% C % D % E. 0.0 % 13. Look at each equation. Are the numbers equivalent? Select Yes or No. A. 2_ 0.4 Yes No B % Yes No C. 1_ 8 12.% Yes No D. 0.1 % Yes No 22 Domain 1: The Number System

8 Lesson 1: Relate Fractions, Decimals, and Percents 14. Write each number under its equivalent number in the table. 7 40% 0.4 % % Antonia ate _ 3 of a bunch of grapes. Circle the percent that makes the statement true % Antonia ate 37.% 38% 37% of the bunch of grapes. 16. Brent read 6 pages of his 64-page book. Which value represents the part of the book that Brent read? Circle all that apply. A B. 7 _ 8 C D. 87.% E. _ 6 F. 8.7% 23

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