Fractions, Decimals, Percents--OH MY!

Fractions, Decimals, Percents--OH MY!

Percent

"per 100"

or

"out of 100"

Real Life Percents: Sports

During the 08-09 NBA season, the Phoenix Suns won about 11/20 of their games. The Miami Heat won about 0.54 of their games. Which team was more successful?

Phoenix Suns

Convert 11/20 to a percent

Multiple Choice

What percent of the games did the Phoenix Suns win if they won 11/20 of their games?

• 11%

• 5%

• 55%

• 20%

Miami Heat

Convert 0.54 to a percent

Multiple Choice

What percent of the games did the Miami Heat win if they won 0.54 of their games?

• 0.54%

• 5.4%

• 54%

• 100%

Benchmark Numbers You Should Memorize

There are some easy numbers you should memorize because they come up in real life a lot

Multiple Choice

Write 3/4 as a percent

• 34%

• 25%

• 75%

• 3.4%

More Benchmarks

Do you see a pattern here that makes the fifths easy to memorize?

Multiple Choice

Write 4/5 as a percent

• 45%

• 20%

• 75%

• 80%

What if it doesn't turn into 100?

You will see fractions that are not easy to make into hundredths.

What now?

Fractions are DIVISION problems!

Just divide the numerator by the denominator to get a decimal answer

Multiple Choice

 $1\ \div\ 8\ =\$  

• 8

• 0.125

• 0.1

• 125

Now multiply the decimal by 100 to convert it to a percent

0.125 = 12.5%

Benchmark: Eighths

If you memorize 1/8 = 12.5%

can you figure out

3/8?

5/8?

7/8?

What's the pattern?

Multiple Choice

What is 1/8 as a percent?

• 0.125%

• 12.5%

• 1.25%

• 18%

Multiple Choice

What is 3/8 as a percent?

• 38%

• 37.5%

• 3.75%

• 0.375

Multiple Choice

What is 5/8 as a percent?

• 58%

• 62.5%

• 6.25%

• 0.625

Multiple Choice

What is 7/8 as a percent?

• 78%

• 87.5%

• 8.75%

• 0.875%

Multiple Choice

Bob gave 2/5 of his candy bar to his brother. What percent of the candy bar did he give his brother?

• 25%

• 20%

• 40%

• 50%

Multiple Choice

Felicia earned 9/10 correct on her math quiz. What percent did she earn?

• 9%

• 10%

• 99%

• 90%

Multiple Choice

1 student out of 20 was absent on Friday. What percent is 1/20?

• 20%

• 5%

• 1%

• 50%

Multiple Choice

Bob earned 21/20 on his spelling quiz (EXTRA CREDIT!) What is his score as a percent?

• 21%

• 210%

• 100%

• 105%

Multiple Choice

What percent would your grade be if you got 6 out of 8 problems correct on a quiz?

• 68%

• 80%

• 75%

• 60%