Problem

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Problem 1

• By
• Krista Batten

School Bus Problem
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• Riding on a school bus are 20 students in 9th
  grade, 10 in 10th grade, 9 in 11th grade and 7 in
  12th grade. Approximately what percent of the
  students on the bus are in 9th grade?

• 23
• 43
• 46
• 76

Click the button to view the percent of the bus
that grade occupies

• 9th Grade
• 10th Grade
• 11th Grade
• 12th Grade

Percent is the fraction of the desired outcomes
over the total possible outcomes.
The bus will be divided into 4 different
sections, each pertaining to a different grade.
Each section will correlate with the percent that
grade occupies on the bus. The students will
click on each grade, and that section will light
up.
School Bus Problem
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Riding on a school bus are 20 students in 9th
grade, 10 in 10th grade, 9 in 11th and 7 in 12th
grade. Approximately what percent of the
students on the bus are in 9th grade?

• Now we take our calculator and divide 20 by 46.
• 2046 .4347826087
• To find percent we take our answer and multiply
  it by 100.
• .4347826087 100 43.47826087
• To see what answer is closest you can find the
  difference between the actual percent and the
  choices for answers
• 43-43.47826087 -.47826087
• 46-43.47826087 2.52173913
• Take the absolute values of the answers
• (-.47826087 is .47826087) So, 43 is the closest!

• Add up the total number of students
• 20109746
• Since there are 20 9thgrade students. We can
  write the fraction of 9th grade students as
• 20/46

School Bus Problem
4

• Riding on a school bus are 20 students in 9th
  grade, 10 in 10th grade,
• 9 in 11th and 7 in 12th grade. Approximately
  what percent of the
• students on the bus are in 9th grade?
• First, add up the total number of students
• 201097 46 total students
• Make a fraction of 9th grade students to the
  total number of students
• 20/46
• By looking at this fraction we can see that 20/46
  is more than 25, so the answer of 23 is
  incorrect. In addition, we can see that 20/46 is
  less than half, so the answer of 76 is
  incorrect.
• If we divide 20 by 46 we will get a decimal
  representation of what the number of 9th grade
  students to the total number of students on the
  bus
• 20 46 .4347826

School Bus Problem
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• If we multiply this decimal by 100 we will get
  the percentage
• .4347826 X 100 43.47826
• Now, we look at our answers and see that 43 is
  the closest because the difference between 43
  and 43.47826 is the smallest
• 43.47826 43 .47826
• 46 - 43.47826 2.5217
• 43 is the correct answer

Problem Name
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Objective

• The student will be able to find percentage and
  approximate percentages for a given set of data

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Example 1
In 1980, the population of Coral Gables, Florida,
was about 43,200. In 1990, the population was
about 40,100. What was the approximate percent of
decrease in population over this ten-year period?
A. 7 B. 8 C. 31 D. 93
http//www.firn.edu/doe/sas/fcat/pdf/fc8mib1r.pdf
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School Bus Problem
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Example 2
Della wants to list the numbers below in order
from least to greatest. 0.714 26 7/60 38/75
Which of the lists below shows the numbers in
order from least to greatest? A.
7/60 26 38/75 .714 B.
.714 26 7/60 38/75 C. 7/60 38/75 .714 26
D. .714 7/60 26 38/75 http//www.mdk12.org/m
spp/k_8/sample_grade7_math.html 8
   
School Bus Problem
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Example 3
A company donated 32 computers to Larrys school.
Larrys class received 8 of the computers.
What percent of the total number of donated
computers did Larrys class receive? A 25 B
40 C 50 D 75
http//title3.sde.state.ok.us/studentassessment/Re
leased20items/OK05s_RIB_g5M_f1g-FINALv2.pdf
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School Bus Problem
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Example 4
Antonio went to the Mens Shop to buy a shirt. He
saw this sign.
He bought 2 identical shirts. The regular price
of one shirt was 22.50.What was the total amount
he paid for the 2 shirts, not including tax? A.
11.25 B. 22.50 C. 33.75 D. 45.00
http//title3.sde.state.ok.us/studentassement/Rele
ased20items/OK05s_RIB_g5M_f1g-FINALv2.pdf
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School Bus Problem
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Example 5

• A pair of jeans costs 34.99 before sales
  tax. After sales tax that some pair of jeans now
  costs 36.75. What is the approximate percent of
  the sales tax?
• 17
• 5
• 34
• 75

School Bus Problem
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Example 6

• There are 9 students whos favorite class is
  math, 4 prefer English,
• 6 favor social studies, and 13 share their
  favorite class as science.
• What is the approximate percent of students who
  prefer math?
• 9
• 22
• 30
• 70

School Bus Problem
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Example 7
Mrs. Newsome said that of the faculty at Long
High School had attended the school as teenagers.
Which decimal and percent are equivalent to?
A. .18, 18 B. 0.125, 12.5 C. 1.8, 180
D. 1.25, 125
http//www.tea.state.tx.us/student.assessment/reso
urces/online/2006/grade7/math/7math.htm
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School Bus Problem
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Problem 8
A regular human hand contains 27 different bones.
There are 206 bones altogether in the whole human
body. Approximately what percent of the bones in
a whole human body are in two hands? A. about
5 B. about 7.6 C. about 13 D. about 26
 
School Bus Problem
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Problem 9

• Its always important to eat healthy! So, Mrs.
  Jacobson decided to go grocery shopping. She
  buys 3 heads of lettuce, 4 oranges, 2 apples, 7
  cucumbers, and 10 kiwi. What percent of all the
  products she bought were fruit?
• 70
• 59
• 25
• 61

School Bus Problem
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Problem 10

• Joshua buys a book that is on sale for 1/5 off.
  What is the percent of discount for the price of
  the book?
• 1/20
• 1/5
• C. 5
• D. 20

School Bus Problem