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Math Problems
Grade 6
Simple interest
Edmond has
$
60
\$60
$60
in a savings account. The interest rate is
5
%
5\%
5%
per year and is not compounded. How much interest will he earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Perry has
$
100
\$100
$100
in a savings account that earns
10
%
10\%
10%
annually. The interest is not compounded. How much interest will he earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
\_\_\_\_
____
Get tutor help
Lily has
$
30
\$30
$30
in a savings account. The interest rate is
10
%
10\%
10%
per year and is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
___
Get tutor help
Martha has
$
20
\$20
$20
in a savings account that earns
10
%
10\%
10%
interest per year. The interest is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
\_\_\_\_
____
Get tutor help
Camilla has
$
70
\$70
$70
in a savings account. The interest rate is
10
%
10\%
10%
per year and is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Sharon has
$
20
\$20
$20
in a savings account that earns
5
%
5\%
5%
annually. The interest is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
\_\_\_\_
____
Get tutor help
Colin has
$
80
\$80
$80
in a savings account that earns
5
%
5\%
5%
interest per year. The interest is not compounded. How much interest will he earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Abigail has
$
30
\$30
$30
in a savings account. The interest rate is
10
%
10\%
10%
per year and is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Fernando has
$
70
\$70
$70
in a savings account that earns
10
%
10\%
10%
annually. The interest is not compounded. How much interest will he earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Zachary has
$
40
\$40
$40
in a savings account. The interest rate is
5
%
5\%
5%
per year and is not compounded. How much interest will he earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
\_\_\_\_
____
Get tutor help
Jennifer has
$
20
\$20
$20
in a savings account. The interest rate is
5
%
5\%
5%
per year and is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
_
\_\_\_\_\_
_____
Get tutor help
Evelyn has
$
100
\$100
$100
in a savings account that earns
10
%
10\%
10%
interest per year. The interest is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
_
\_\_\_\_\_
_____
Get tutor help
Camille has
$
100
\$100
$100
in a savings account. The interest rate is
10
%
10\%
10%
per year and is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Jaden has
$
60
\$60
$60
in a savings account that earns
10
%
10\%
10%
interest per year. The interest is not compounded. How much interest will he earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
___
Get tutor help
Sidney has
$
100
\$100
$100
in a savings account that earns
10
%
10\%
10%
annually. The interest is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_
_
_
_
\_\_\_\_
____
Get tutor help
Jenna has
$
80
\$80
$80
in a savings account. The interest rate is
5
%
5\%
5%
per year and is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
_____
Get tutor help
Rosanne has
$
90
\$90
$90
in a savings account that earns
10
%
10\%
10%
annually. The interest is not compounded. How much interest will she earn in
1
1
1
year?
\newline
Use the formula
i
=
p
r
t
i = prt
i
=
p
r
t
, where
i
i
i
is the interest earned,
p
p
p
is the principal (starting amount),
r
r
r
is the interest rate expressed as a decimal, and
t
t
t
is the time in years.
\newline
$
\$
$
___
Get tutor help
A group consisting of
23
23
23
aggressive zombies triples in size every hour. Which equation matches the number of zombies after
2
2
2
hours?
\newline
Z
=
23
(
3
)
2
Z=23(3)^{2}
Z
=
23
(
3
)
2
\newline
Z
=
3
(
1
+
23
)
2
Z=3(1+23)^{2}
Z
=
3
(
1
+
23
)
2
\newline
Z
=
23
(
1
+
3
)
2
Z=23(1+3)^{2}
Z
=
23
(
1
+
3
)
2
\newline
Z
=
3
(
23
)
(
23
)
Z=3(23)(23)
Z
=
3
(
23
)
(
23
)
Get tutor help
A group consisting of
21
21
21
aggressive zombies triples in size every hour. Which equation matches the number of zombies after
4
4
4
hours?
\newline
Z
=
21
(
3
)
4
Z=21(3)^{4}
Z
=
21
(
3
)
4
\newline
Z
=
3
(
21
)
4
Z=3(21)^{4}
Z
=
3
(
21
)
4
\newline
Z
=
3
(
21
)
(
21
)
(
21
)
(
21
)
Z=3(21)(21)(21)(21)
Z
=
3
(
21
)
(
21
)
(
21
)
(
21
)
\newline
Z
=
21
(
3
)
(
3
)
Z=21(3)(3)
Z
=
21
(
3
)
(
3
)
Get tutor help
The formula for simple interest is
I
=
P
r
t
I=P r t
I
=
P
r
t
, where
I
I
I
is the interest earned,
P
P
P
is the principal,
r
r
r
is the interest rate and
t
t
t
is the number of years. Solve the formula for
r
r
r
in terms of
P
,
I
P, I
P
,
I
and
t
t
t
.
\newline
Answer:
r
=
r=
r
=
Get tutor help
