Finding A Percent of A Number
Jillian has $40. She wants to buy a new bicycle that costs $50. What percent of the money needed does she already have saved up?
80%
40 divided by 50=0.8, so she has 80% of the money that she needs.
12 is 20% of what number?
60
12/x = 20/100
12(100)=1200
1200/20=60
At a 50% off sale, Bryan bought a deck of baseball cards that were originally $12. How much did Bryan pay?
$6
50% means half, so half of 12=6.
Or, 0.50x12=6 12-6=6.
If Ian drove for 210 miles and it took him 3 hours to get to his destination, what was his speed in miles per hour?
70 mph
210 miles divided by 3 hours = 70 miles per hour
The word "of" tells us to do what operation?
a. add
b. subtract
c. multiply
d. divide
c. multiply
In class, there are 5 kids wearing an orange shirt, 6 kids wearing a red shirt, and 7 kids wearing a blue shirt. What percent of the class is wearing a red shirt?
33%
6 divided by 18 = 0.33.
18 is 40% of what number?
45
18/x=40/100
18(100)=1800
1800/40=45
Desiree went to a 40% off sale at the shoe store. She found a pair that was originally $30. What is the sale price of the shoes?
$18
0.40x30=12
30-12=18
Tammy bought doughnuts for everyone at work. She bought 6 doughnuts and her total was $12.30. What is the cost per doughnut?
$2.05
12.30 divided by 6 = 2.05
The line in a fraction tells us to do what operation?
a. add
b. subtract
c. multiply
d. divide
d. divide
Kim and Khloe went shopping. They found a shirt that was originally $40, but today it was on sale for $30. What % off was the store's sale today?
25% off
30 divided by 40=0.75 This means that they paid 75% of the original cost. So 100% - 75% means that they received a 25% off discount at the sale.
9 is 30% of what number?
30
9/x=30/100
9(100)=900
900/30=30
Harper bought a hat for $12 at a 25% off sale. What was the original cost of the hat?
$16
100-25=75. So, Harper paid 75% of the original cost.
12/x = 75/100
12(100)=1200
1200/75=16
It takes Bill 4 minutes to swim 2 laps. How many minutes does it take Bill to swim 1 lap?
2 minutes
4 minutes divided by 2 laps = 2 min. per lap
Per means what?
for each or for one
Carol has a bowl of fruit containing 3 apples, 2 oranges, 3 bananas, and 12 grapes. What percent of the fruit are the apples?
15%
3 divided by 20=0.15
18 is 60% of what number?
30
18/x=60/100
18(100)=1800
1800/60=30
John bought a new lawn mower for 40% off at Sears. The lawn mower was originally $5600. What did he pay for the lawn mower at the sale?
$3360
0.40x5600=2240
5600-2240=3360
Noah and Charlie are 15 miles apart on a bike path when they start biking toward each other. Noah rides at a constant speed of 4 miles per hour, and Charlie rides at a constant speed of 2 miles per hour. How long does it take until Noah and Charlie meet?
2.5 hours
4+2=6 Together, they travel at 6 mph.
15 miles divided by 6 mph = 2.5
What does unit rate mean?
Unit rate is the rate for one item or the price for one item.
Janet is buying a new car. Her budget is $50,000. She finds a car that she likes for $43,000. What percent of her budget is the car that she likes?
86%
43,000 divided by 50,000 = 0.86.
45 is 75% of what number?
60
45/x=75/100
45(100)=4500
4500/75=60
Sadie makes keychains to sell on Etsy. She usually charges $8 per keychain but is currently giving her customers 20% off. What is the sale price of the keychains?
$6.40
0.20x8=1.60
8.00-1.60=6.40
It took 4 hours to drive 240 miles. At this rate, how long does it take to drive 90 miles?
1.5 hours
4 hours divided by 240 miles = 0.0166666667
0.0166666667 x 90 = 1.5
What does the word 'percent' mean?
per 100 or for each 100