Fractions
What is 42% written as a decimal?
What is .42
What is 9/10 written as a percent?
What is 90%
If a student has finished 3/5 of his homework, what percent has he finished?
60%
3/5 = 60/100
= 60%
What is the rule for converting from decimal to percent?
Move the decimal 2 places to the right and add the percent symbol.
What is 45% written as a fraction?
What is 45/100 which simplifies to 9/20
What is 7/8 written as a decimal?
What is .875
What is 14/20 written as a percent?
What is 70%
if 12 out of 15 students in the class have a pet, what percent of the class does not have a pet?
80%
12/15 = 4/5 = 80/100 = 80%
100% - 80% = 20%
What is the name of 2 ratios that are equivalent?
A proportion
What is 14/20 written as a decimal?
What is .7
Write this decimal as a percent .04
What is 4%
If a student answers 22 out of 25 questions correctly on a quiz, what percent of answers did he get correct?
88%
22/25 = 88/100 = 88%
How can you check if 2 ratios are proportional?
Hint: this is how you solve for a missing value in a proportion
If the cross products are equal the ratios are proportional.
What is 150 % written as a decimal
What is 1.5
What is 2 1/4 written as a percent?
What is 225%
If you pay a waitress a 15% tip on a lunch bill of $28.00, how much is the tip?
$4.20
10% of 28 = 2.8
5% of 28 = 1.4
15% = 4.2 = $4.20
Students in Math Lab were surveyed on their favorite Christmas movie. 4 out of 16 students said their favorite movie was Rudolph the Red Nosed Reindeer. What percent of students chose Rudolph the Red Nosed Reindeer?
25%
4/16 = 1/4
1/4 = 25/100
= 25%
What is 180% written as a fraction?
What is 180/100 which simplifies to 18/10 = 9/5 = 1 4/5
What is 37.5% written as a decimal?
What is .375
Write this fraction as a percent rounded to the nearest hundredth. 6/7
What is 86%
There are 300 6th graders. If 35% of students are absent due to sickness, how many 6th graders are in school?
195 6th graders are in school
Use mental math to find 30% of 140.
42
10% of 140 = 14 so 30% is 3(14) which equals 42.