Percents, Decimals, and FractionsTextbook Pages 429-433

Monday January 13th

Objective

• I can write equivalent percents, fractions, and decimals.

Writing fractions as Percents!

• If Max made 7 out of 10 free throws and John made 17 out of 25 free throws. Who had a better percent?

• First write each result as a fraction.• 7 17 10 25Then write an equivalent fraction with a

denominator of 100 to find the percent.

• 7/10 17/25• __/100 ___/100• 70/100 68/100• 70% 68%Remember when making equivalent fractions

whatever you do to the bottom you do to the top.

Try some

• ¾• 75%• 7/20• 35%• 3/25• 12%

Is there another way to find the percent from a fraction.

• Just divide the fraction out to find the decimal.

Write decimals as Percents

• Remember when we changed a percent to a decimal we divided by 100.

• Just like most things in math, in order to undo something we do the opposite.

• To change a decimal to a percent, multiply by 100.

Making decimal a percent

0.27Take this and multiply by 100 to get the percent.0.27 x 100 = 27%

Or move the decimal two spots to the right.

Another way!

• You can read the decimal and make a fraction>• 0.25• You would read this how?• Twenty hundredths, which means 25 over 100• 25/100• Which is 25%

Try Some

• 0.3• 30%• 0.105• 10.5%

Benchmark Percents, Fractions, Decimals

You can use benchmark percent to write other percents, decimals, or fractions.

Use benchmark percents to help you locate where others may fall.

Concept SummaryBenchmark Percent, Decimals, and fractions• Thirds• 33 1/3% = 0.33 = 1/3• 66 2/3% = 0.66 = 2/3• Fourths• 25% = 0.25 = ¼• 50% = 0.50 = ½• 75% = 0.75 = 3/4

Concept SummaryBenchmark Percent, Decimals, and fractions

• Fifths• 20% = 0.2 = 1/5• 40% = 0.4 = 2/5• 60% = 0.6 = 3/5• 80% = 0.8 = 4/5

Concept SummaryBenchmark Percent, Decimals, and fractions

• Tenths• 10%=0.1=1/10 20%=0.2=2/10• 30%=0.3=3/10 40%=0.4=4/10• 50%=0.5=5/10 60%=0.6=6/10• 70%=0.7=7/10 80%=0.8=8/10• 90%=0.9=9/10

Homework

• Workbook pages 111-112