Home
Grade 1Grade 2Grade 3Grade 4Grade 5Grade 6Grade 7Grade 8Grade 9Grade 10Grade 11Grade 12Math Themes
Explorers (Grades 1-3)Explorers Elite (1-3)Navigators (Grades 4-6)Navigators Elite (4-6)Challengers (Grades 7-9)Challengers Elite (7-9)Schedule an Evaluation
Mobius MethodFlexible ClassesCompanySupport
Pricing
Ctrl+k
Sign InJoin
Interest (Simple) - Principle from Interest, Rate, and Time

Level 2

This math topic focuses on calculating the principal amount in various simple interest problems, using given values for interest, rate, and time. It practices deriving the initial amount of money loaned or invested, based on the interest it earns over a specified period at a specified rate, enhancing skills in working with percentages and basic algebraic manipulations within the context of financial mathematics. Each question provides a financial scenario, and multiple-choice answers are offered to determine the principal amount.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

more
View

Interest (Simple) - Principle from Interest, Rate, and Time Worksheet

Mobius Math Academy logo
Interest (Simple) - Principle from Interest, Rate, and Time
1
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$1260\\ \text{Rate } &= 20\%\\ \text{Time } &= 7\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
900
b
1,170
c
450
d
810
e
1,530
f
270
2
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$420\\ \text{Rate } &= 20\%\\ \text{Time } &= 7\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
60
b
150
c
240
d
300
e
360
f
270
3
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$400\\ \text{Rate } &= 20\%\\ \text{Time } &= 5\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
600
b
280
c
680
d
560
e
400
f
480
4
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$160\\ \text{Rate } &= 20\%\\ \text{Time } &= 4\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
200
b
340
c
160
d
380
e
360
f
140
5
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$1260\\ \text{Rate } &= 20\%\\ \text{Time } &= 9\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
630
b
70
c
420
d
560
e
700
f
280
6
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$1120\\ \text{Rate } &= 20\%\\ \text{Time } &= 8\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
490
b
70
c
700
d
980
e
560
f
840
7
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$100\\ \text{Rate } &= 10\%\\ \text{Time } &= 2\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
950
b
650
c
150
d
500
e
750
f
300
8
What is the principle in this simple interest situation?
A LaTex expression showing \begin{align*}\text{Interest } &= \$1920\\ \text{Rate } &= 30\%\\ \text{Time } &= 8\text{yrs}\\ \\ \text{Principle } &= \$?\end{align*}
a
1,440
b
800
c
160
d
720
e
1,040
f
240