Page 239 - NUMINO TG_6A
P. 239
Activity 3 Simple Interest
jOb ective Learn about interest and how it is calculated.
1. Textbook Instructions Activity 3 Simple Interest
Explain to students that calculating interest is We go to a bank when we want to deposit money.
another use for percentages and is similar to The money deposited in the bank is regularly added up.
calculating the sales tax on something they The original money we put in the bank is called the principal.
want to buy. Explain the formula to determine Simple interest is a fixed percent of the principal and is paid yearly.
simple interest: I p r t
interest (I), principal (p), interest rate per year Simple interest can be calculated by using the following method.
(r), time in years (t).
I=p r t I: interest
p: principal
The principal is the original amount of r: interest rate per year
t: time in years
money the student started with. To find the
interest for one year, convert the interest
rate percent to a decimal and then multiply it
by the principal. To find the total simple
interest for another time period, multiply the 1 . Find the simple interest.
interest for one year by the number of years. principal: $50
interest rate: 7%
Refer to . time: 3 years I=p r t
= $50 0.07
= $10.50 3
1. Have students find the simple interest a. b.
using the given information. principal: $140 principal: $200
interest rate: 6%
interest rate: 5% time: 5 years
time: 2 years I = $200 0.06 5
= $60
I =p r t 2
= $140 0.05
= $14
136
2. Build Understanding
This section is a matter of plugging the given numbers into the equation.
Example: Find the simple interest.
principal: $50 interest rate: 7% time: 3 years
We know the equation I p r t. Plug in the numbers to get:
I $50 0.07 3
$10.50
222 NUMINO Teacher s Guide
jOb ective Learn about interest and how it is calculated.
1. Textbook Instructions Activity 3 Simple Interest
Explain to students that calculating interest is We go to a bank when we want to deposit money.
another use for percentages and is similar to The money deposited in the bank is regularly added up.
calculating the sales tax on something they The original money we put in the bank is called the principal.
want to buy. Explain the formula to determine Simple interest is a fixed percent of the principal and is paid yearly.
simple interest: I p r t
interest (I), principal (p), interest rate per year Simple interest can be calculated by using the following method.
(r), time in years (t).
I=p r t I: interest
p: principal
The principal is the original amount of r: interest rate per year
t: time in years
money the student started with. To find the
interest for one year, convert the interest
rate percent to a decimal and then multiply it
by the principal. To find the total simple
interest for another time period, multiply the 1 . Find the simple interest.
interest for one year by the number of years. principal: $50
interest rate: 7%
Refer to . time: 3 years I=p r t
= $50 0.07
= $10.50 3
1. Have students find the simple interest a. b.
using the given information. principal: $140 principal: $200
interest rate: 6%
interest rate: 5% time: 5 years
time: 2 years I = $200 0.06 5
= $60
I =p r t 2
= $140 0.05
= $14
136
2. Build Understanding
This section is a matter of plugging the given numbers into the equation.
Example: Find the simple interest.
principal: $50 interest rate: 7% time: 3 years
We know the equation I p r t. Plug in the numbers to get:
I $50 0.07 3
$10.50
222 NUMINO Teacher s Guide
