Just do the numbers!
What is 10% of 1000?
100
5 is 10% of what number?
50
A student earned a grade of 80% on a math test that had 20 problems. How many problems on this test did the student answer correctly? Assume each problem is worth the same marks.
20*80%=20*0.8=16
A student answered 86 problems on a test correctly and received a grade 98%. How many problems were on the test, if all the problems were worth the same number of points? (Round to the nearest whole number)
86/98%=87.75=88
Which is a better deal?
A. 25% discount of original price of $80
B. 25% discount of original price of $100, minus $20
B
What is 25% of 160?
40
20 is 200% of what number?
10
There are 28 students in a class. Sixteen of those students are boys. What percent of the class are girls?
28 total students -16 boys=12 girls
12/28*100%=3/7*100%=42.85%
Or is there another way??
1-16/28
Pamela bought an electric drill at 80% of the regular price. She paid $40 for the drill. What was the regular price? (Round to the nearest cent)
$40*80%=$50
Class A's students is 80% of Class B's students. Class B's students is 120% of Class C's students. Class C has 100 students. How many students does Class A have?
100*120%*80%
=120*0.8
=96
What is 75% of 1000?
750
1 is 1% of what number?
100
Jerry, an electrician, worked 7 months out of the year. What percent of the year did he work?
7/12*100%
Answer: 58.33%
A crew is made up of 8 men; the rest are women. 2/3 of the crew are men. How many people are in the crew?
8*2/3=12
One school playground's area will be decreased by 20% and the other school playground with the same area will be increased by 20%. After this change, what is the ratio between the two playground's area?
80%:120%=
2:3
What is 2% of 200?
4
0.5 is 5% of what number?
10
A woman put $600 into a savings account for one year. The rate of interest on the account was 3%. How much was the interest for the year in dollars and cents?
600*3%
=600*0.03
=18
Ben earns $12,800 a year. About 15% is taken out for taxes. How much is taken out for taxes?
12000*15%=1800
4 students left the classroom for a game Now there are only 80% of the students are in the class. An hour later, 2 students came back. How many students are present now?
4/(1-80%)=20 total number of students
20-4+2=18
18/20=90%
Is there a faster way?
Yes!! if 4 accounts for 20%, then 2 accounts for 10%. That means 90% are in the classroom.
what is 200% of 10?
20
2.5 is _% of 50?
5
Province Population % of Canada
Ontario 13,448,494 38.26%
What is the total population of Canada?
13,448,494 / 38.26%
=35,150,272
The Royals softball team played 100 games and won 58 of them. What percent of the games did they lose? (round to the nearest tenth)
(100-58)/100*100%=42%
If a hockey team has 16 players and one is goalie. For any game, each team should have 5 players on the ice. What fraction of ice time does each player have assuming all the 16 players play for the game?
If each game lasts for 45 minutes, how many minutes in total does each player play on the ice?
If the total time including travelling, change and meeting is 2 hours, what fraction is ice time of the total time.
45*1/3=15 minutes.
15/(2*60+15)
=1/(8+1)=1/9