Writing Decimals and Fractions as Percents
It means Per – 100 (like 100 cents in a dollar) When we say percent, we mean, how many equal parts of 100. For example, “One percent” (written 1%) means 1 of 100 equal parts. (1/100) “Fifty percent” (written 50%) means 50 out of 100. (50/100)
So 50/100 is the same as 0.50 is the same as 50% So 1/100 is the same as 0.01 is the same as 1%
To write a decimal as a percent, move the decimal point two places to the right and attach a percent sign (%) = 75%
Write the following decimals as percents: ◦.35 ◦.42 ◦.58 35% 42% 58%
Try writing these decimals as percents: ◦.011 ◦.3467 ◦ 2.6 ◦ % 34.67% 260%.8%
There are multiple ways to write a fraction as a percent. ◦ Method 1: Convert the denominator of the fraction to 100, then the percent is the numerator. ◦ Method 2: Multiply the fraction by 100%, then simplify. ◦ Method 3: Change the fraction to a decimal, and then write it as a percent.
8 20 555 == 40%
4545 = 4545 100% = 400% 5 = 80% 3838 = 37.5%
1212 = 0.5 = 50%
Write the following fractions as percents. ◦ 7/20 ◦ 11/50 ◦ 22/25 ◦ 2/5 ◦ 5/8 35% 22% 88% 40% 62.5%
To write a percent as a decimal, move the decimal point two places to the left and drop the percent sign (%) % =
Change the following percents to decimals: ◦ 35% ◦ 50% ◦ 325% ◦ 37½%
Try writing these percents as decimals. ◦ ½% ◦ ¾% ◦ ¼% 0.5% = % = % =.0025
Find a newspaper article that mentions at least three different percentages. Bring the article to class. Hi-light the percentages. Write in complete sentences what these percents are used for. Change the percentages to decimals. Change the percentages to fractions.