Reviewing Percents.

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Presentation transcript:

Reviewing Percents

What are percents?

"Percent" comes from the Latin Per Centum "Percent" comes from the Latin Per Centum. The Latin word Centum means 100, for example a Century is 100 years.

So percent means…… The number of something per (or out of) 100 So, 40% is…. 40 out of 100 or… 40/100 Now you’ve written a percent as a fraction. So percent means……

How would you write 77% as a fraction? 77/100 What about 60% ? 60/100 This would reduce to 3/5 Let’s try some more….

Converting percents to decimals

How do you write them as a decimal? There are only two steps. Drop the percent sign Then move the decimal two places to the left How do you write them as a decimal?

Let’s try some examples 115% Drop the percent sign 115. Move the decimal two places to the left 1.15 5% Drop the percent sign 5. Move the decimal two places to the left .05

One more…. 15.7 .157 15.7% Excellent!! What was the first step? Now for the second step… .157 Excellent!!

Converting Decimals to Percents To turn a decimal into a percent you just reverse the steps. Move the decimal two places to the RIGHT and add the % sign.

Let’s convert some decimals to percent .98 Move the decimal two places to the right. 98. Add the percent sign 98% 22.76 Move the decimal two places to the right. 2276. Add the percent sign 2276% Let’s convert some decimals to percent

Converting fractions to percents

How do you turn a fraction into a percent? First you have to convert it into a decimal. Just divide the top number (numerator) by the bottom number (denominator). Ex. 11/25 = 11 divided by 25 The answer is .44 Then convert the decimal to a percent. 44% How do you turn a fraction into a percent?

Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63% Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 0.10 Fraction Decimal Percent 1/2 0.63 10% 1/4 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 0.10 0.25 Fraction Decimal Percent 1/2 0.63 10% 1/4 0.25 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 0.10 0.25 25% Fraction Decimal Percent 1/2 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 0.15 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 0.10 0.25 25% 15% Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 0.15 15% 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 0.10 0.25 25% 3/20 15% Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

0.50 50% 63/100 63% 1/10 0.10 0.25 25% 3/20 15% 3/25 Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 3/25 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 3/25 0.12% 12% 100% 3/4 Remember to reduce the fraction to its simplest form.

Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 3/25 0.12% 12% 1 100% 3/4 Remember to reduce the fraction to its simplest form.

Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 3/25 0.12% 12% 1 100% 3/4 Remember to reduce the fraction to its simplest form.

Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 3/25 0.12% 12% 1 100% 3/4 0.75 Remember to reduce the fraction to its simplest form.

Fraction Decimal Percent 1/2 0.50 50% 63/100 0.63 63% 1/10 0.10 10% 1/4 0.25 25% 3/20 0.15 15% 3/25 0.12% 12% 1 100% 3/4 0.75 75% Remember to reduce the fraction to its simplest form.