Letter To Family - Calculating Simple Interest, Sales Tax And Discounts
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1Chapter 8 8
What We’re Learning
Vocabulary
rate A comparison by a ratio of
During the next few weeks, our math class
two quantities using different kinds of
will be using percent to calculate simple
units.
interest, sales tax, and discounts.
base A number to which a rate is
You can expect to see work that requires
applied to determine a percentage.
students to make calculations involving
percentage The percent of a
percent. You may wish to use the following
number, calculated by multiplying the
samples as guides to help your child.
rate times the base.
Guiding Your Child
Using the Percent Equation
Suppose 42% of the 7,700 voters in an election voted for Candidate A. How many votes did Candidate A get?
Use the formula P
R
B, where P
percentage,
P
0.42
7,700
3,234
R
rate, and B
base. Forty-two percent can be
4
2
Candidate A got 3,234 votes.
represented as 42%, 0.42, or
.
1
0
0
151
R
604
Suppose 151 of the 604 tickets to a show
151
604
R
were not sold. What percent of the tickets
0.25
R
were not sold? Use the formula P
R
B
to find the answer.
25% of the tickets were not sold.
125
0.20
B
Suppose 20%, or 125, of the commuters polled said
125
0.20
B
they were satisfied with bus service. How many
625
B
commuters were polled? Use the formula P
R
B
to find the answer.
625 commuters were polled.
During this chapter, students will need to continue practicing
basic addition, subtraction, multiplication, and division facts.
Sincerely,
Your child’s teacher
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