Transcript +.68 - Cobb Learning

AGREE OR DISAGREE
A REVIEW OF UNIT 1 WITH ERROR ANALYSIS
QUESTION 1
Find the greatest common factor of 24 and 30
The GCF of 24 and 30 is 3.
Disagree
The GCF is 6
QUESTION 2
Find the least common multiple of 5 and 12.
The LCM is 60.
Agree
QUESTION 3
400 ÷ 12
33.3333
33 1/3
33 r 4
Agree
QUESTION 4
13.2 + .68
13.2
+.68
.200
Disagree
The decimals are not lined up.
The correct answer is 13.88
QUESTION 5
.45 x 12.3
5.535
Agree
The number of decimal places in the original problem must equal the number of decimal places in the final
answer.
QUESTION 6
¾ ÷ 2/3
6/12 or 1/2
Disagree
To solve a division fraction problem, the second fraction must be flipped.
The correct answer is 1 1/8.
QUESTION 7
12 – 0.48
.36
Disagree
The decimals were not lined up and the order of the numbers was switched. You must put a decimal and
two zeroes behind the 12 to get the correct answer of 11.52.
QUESTION 8
4 2/3 ÷ 1/4
2 14/15
Agree
14/3
4/1
14/3 x 1/4
14/12 = 1 2/12
1 1/6
QUESTION 9
Ellen has thirty pounds of chocolate. She wants to divide the chocolate into ¾ pound bags. How many bags of
chocolate can she make?
Ellen can make 40 bags of chocolate weighing ¾ pounds.
Agree
30/1
¾ = 30/1
4/3 = 120/3 = 40
QUESTION 10
Jane has $42.75 to buy candy to hand out for Halloween. The Starbursts she wishes to buy are $2.25 for
each bag. How many bags can she buy?
She can purchase 19 bags of Starbursts.
Agree
QUESTION 11
You have 125 laser tag tickets to give to 20 party guests. To be fair, you want each guest to get the same
number of tokens. How many should you give each guest?
He can give each guest 7 tokens.
Disagree
The answer is 6.25, so you need to round down.
He can only give 6 tickets to each guest. He will have 5 tickets left over
QUESTION 12
Grady the fat cat weighed 45.25 kilograms. His vet put him on a strict diet and he lost 7.9 kilograms. How
much does he weigh after losing the weight?
He now weighs 44.46 kilograms.
Disagree
The decimals were not lined up to find this answer.
His new weight is now 37.35 kilograms.
QUESTION 13
Elliott is cutting a roll of cookie dough into pieces that are ½ inch thick. If the roll of cookie dough is 5 ½
inches long, which model below best represents the situation?
Agree
QUESTION 14
Jill made 12 cakes with 1 1/3 tablespoons of vanilla. How much vanilla would she need to make just
ONE cake?
She needs 9 tablespoons of vanilla for one cake.
Disagree
1 1/3 ÷ 12
QUESTION 15
Pablo and Jane need 4 boxes of cereal priced at $2.95 per box. How much will the cereal cost?
The cost will be $.74 per box.
Disagree
To solve this problem you should multiply.
The correct answer is $11.80.
QUESTION 16
Kim has 25 meters of ribbon to make bows. If each bow requires 0.6 meters of ribbon, how many bows can
she make?
Kim can make 4 bows.
Disagree
She can make 41.666 bows. Therefore, she can only make 41 bows.
QUESTION 17
Mark and Jeff are comparing their answers to the problem: 0.8 + 10.339. Their work is shown below.
Explain which student is correct.
Mark
Jeff
0.8
+10.339
10.347
0.800
+10.339
11.139
I agree with Jeff.
Agree
QUESTION 18
Inez waters her plants every four days. She trims them every 15 days. She did both today. When will
again water and trim the plants on the same day?
She will do both activities in 19 days.
Disagree
You must find the LCM of 4 an 15 to determine the next time she does both activities. She will do them
both in 60 days.
QUESTION 19
An airport offers two shuttles that run on different schedules. Shuttle A departs every 6 minutes and
shuttle B leaves every 9 minutes. If both shuttles leave the airport at 4:00 p.m., at what time will they next
leave the airport together?
They will leave the airport together again at 4:18 p.m.
Agree
It asks for time and not minutes. Since 18 is the LCM, I added 18 minutes to 4:00 p.m.
QUESTION 20
Is this a true or false statement?
65 + 80 = 5(13 + 16)
True
Agree.
The GCF of 65 and 80 is 5, so if I divide 65 and 80 by 5 I am left with 13 and 16.
QUESTION 21
How would you write this number sentence using distributive property?
12 + 44
2(6 + 22)
Disagree
Two isn’t the GCF of 12 and 44. It should be 4(3 + 11).