No Calc. Needed
Growth or Decline
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Price is Right?
That, That, & More
100
Change the fraction to a decimal using long division:
4/9
4/9 = 0.4444444
100
Ellie sold 40% of her cupcakes at the bake sale. She now has 30 cupcakes left. How many did she bring to the bake sale?
% x OG = NA
.6 x OG = 30
50 cupcakes
100
Sarah thought it would only take an hour to clean, but it actually took her two and a half hours. What is the percent error for her estimate?
difference/actual
1.5/2.5 = 0.6
60%
100
Jimmy buys sunglasses that have a $10 price tag, but there is a 5% sales tax. How much does Jimmy pay?
% x OG = NA
1.05 x 10 = NA
$10.50
100
What is 35% of 70?
0.35 x 70 = 24.5
200
Change the fraction to a decimal using long division:
3/8
3/8 = 0.375
200
Last summer, a chess club had 80 members. This summer, it has 20% fewer members. How many members are there now?
% x OG = NA
.8 x 80 = 64 members
200
Dom estimates that his hand is 20 centimeters long. When he measures with a ruler, however, he finds that his hand is actually 18 centimeters long. What is the percent error for his estimate?
Difference/Actual
2/18 = 0.1111
11.11% or 11%
200
*Lilly earns $20 per hour.The store offers her a raise—a 6% increase. After the raise, how much will Lilly make per hour?
% x OG = NA
1.06 x 20 = NA
NA = $21.20
200
Write a situation that matches this tape diagram:
ANSWERS VARY
Something about a 25% increase.
300
Bamboo grows quickly. You could observe 30 centimeters of growth in just 1/3 of a day. At what rate does this bamboo grow? (cm per day)
cm per day
30 ÷ (1/3) = 90 cm per day
300
Gabby's account balance was $74 last month, and 50% more this month. What is the account balance this month?
% x OG = NA
1.5 x 74 = $111
300
Brianna estimated that she would spend $60 shopping for school supplies before the start of the school year. She actually spent $55. What is the percent error for her estimate?
difference/actual
5/55 = 0.0909
9% or 9.1%
300
*Issac has a 15% off coupon to use to buy a new hat. The regular price for the hat is $30, how much does Issac pay for the hat?
% x OG = NA
.85 x 30 = $25.50
300
Write a situation for this Tape Diagram: (x is the initial value)
ANSWERS VARY:
Must be about a decrease by 20%
400
Aubrey & Calleigh they have painted 1/4
of a house in 2/5 of a day. At what rate are they painting? (hint: amount painted per day)
amount painted per day
1/4 ÷ 2/5 = 5/8 of the house per day
400
*The store buys a TV for $100 and sells it for $250. What percentage is the markup?
% x OG = NA
% x 100 = 250
% = 2.5 or 250%
So, that is a 150% markup
400
Before football tryouts, Leon predicted he could throw a football 24 yards. During tryouts, he was able to throw a football 30 yards. What is the percent error for his prediction?
% error = difference/actual
6/30 = 0.2
20%
400
*Travis has a coupon for 30% off at his favorite store. He paid $38.50 for the video game. What was the regular price of the video game?
% x OG = NA
0.7 x OG = 38.50
$55
400
THREE ANSWERS FOR THIS ONE:
There are 40 marbles in a bag. If 20 are blue, 12 are red, and 8 are green. What percentage of the marbles are...
Blue?
Red?
Green?
Blue: 20/40 = 50%
Red: 12/40 = 30%
Green 8/40 = 20%
500
*It takes Adam 1/10 of an hour to complete a lap on a circular bike track. The track is 1/4 of a mile long. What is Adam’s bike speed in MPH?
Miles Per Hour = 1/4 DIVIDED BY 1/10
10/4 or 2.5 MPH
500
*A school has two gyms. The small gym is 30 m long. The big gym is 40% longer than the small gym. How long is the big gym?
% x OG = NA
1.4 x 30 = 42 m long
500
*A wooden board is 7.5 feet long. When Han measures the board, his measurement is 7 feet. What is his percent error?
0.5 / 7.5 = 0.067 or 6.7% error
500
*Payton earns a commission that is 4.5% of the amount she sells. Last week, she sold $9,500 worth of electronics. How much was her commission?
% x OG = NA
0.045 x 9500 = NA
NA = $427.50
500
There are drinks in a vending machine. If 10 are Bubblr's, 17 are Celsius, and 13 are Alani's, what percentage of the drinks are Celsius?
40 total drinks, so 17/40 = 42.5%