Worksheets · Algebra 1

Algebra 1 simple interest worksheet

Simple interest is paid on the original amount only, the same every year: I = Prt, where P is the principal, r the yearly rate as a decimal and t the time in years. The total at the end is the principal plus the interest.

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Pick more than one for a sheet that mixes them.

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

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Name

Simple Interest

Date Period

Answer each question. Write money to the cent.

  1. A bank pays simple interest of 5% a year on $1,950. How much interest is earned in 8 years?
  2. You deposit $1,900 at 4.5% simple interest a year. How much is in the account after 5 years?
  3. $550 at 3.5% simple interest earns $96.25. For how many years was it invested?
  4. $5100 at 10% compounded annually for 12 years
  5. A certificate of deposit pays simple interest of 7% a year on $1,400. How much interest is earned in 3 years?
  6. You deposit $1,750 at 3% simple interest a year. How much is in the account after 5 years?
  7. $3,000 earns $780 in simple interest over 4 years. What is the yearly interest rate?
  8. $2700 at 11% compounded annually for 16 years
  9. A bond pays simple interest of 6% a year on $950. How much interest is earned in 3 years?
  10. You deposit $2,200 at 3.5% simple interest a year. How much is in the account after 8 years?
  11. An account pays 7% simple interest and earns $301 in 2 years. How much was deposited?
  12. $3200 at 12% compounded monthly for 16 years
  13. A bond pays simple interest of 6% a year on $2,200. How much interest is earned in 2 years?
  14. You deposit $650 at 2.5% simple interest a year. How much is in the account after 4 years?
  15. $1,650 earns $231 in simple interest over 7 years. What is the yearly interest rate?
  16. $3300 at 12% compounded annually for 13 years
  17. A savings account pays simple interest of 4% a year on $2,050. How much interest is earned in 2 years?
  18. You deposit $1,050 at 6% simple interest a year. How much is in the account after 5 years?
  19. $800 earns $224 in simple interest over 8 years. What is the yearly interest rate?
  20. $2800 at 9% compounded semiannually for 20 years

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Simple InterestAnswer keyVersion 1

Date Period

Answer each question. Write money to the cent.

  1. A bank pays simple interest of 5% a year on $1,950. How much interest is earned in 8 years?$780
  2. You deposit $1,900 at 4.5% simple interest a year. How much is in the account after 5 years?$2,327.50
  3. $550 at 3.5% simple interest earns $96.25. For how many years was it invested?5
  4. $5100 at 10% compounded annually for 12 years$16005.98
  5. A certificate of deposit pays simple interest of 7% a year on $1,400. How much interest is earned in 3 years?$294
  6. You deposit $1,750 at 3% simple interest a year. How much is in the account after 5 years?$2,012.50
  7. $3,000 earns $780 in simple interest over 4 years. What is the yearly interest rate?6.5%
  8. $2700 at 11% compounded annually for 16 years$14339.41
  9. A bond pays simple interest of 6% a year on $950. How much interest is earned in 3 years?$171
  10. You deposit $2,200 at 3.5% simple interest a year. How much is in the account after 8 years?$2,816
  11. An account pays 7% simple interest and earns $301 in 2 years. How much was deposited?$2,150
  12. $3200 at 12% compounded monthly for 16 years$21619.90
  13. A bond pays simple interest of 6% a year on $2,200. How much interest is earned in 2 years?$264
  14. You deposit $650 at 2.5% simple interest a year. How much is in the account after 4 years?$715
  15. $1,650 earns $231 in simple interest over 7 years. What is the yearly interest rate?2%
  16. $3300 at 12% compounded annually for 13 years$14399.53
  17. A savings account pays simple interest of 4% a year on $2,050. How much interest is earned in 2 years?$164
  18. You deposit $1,050 at 6% simple interest a year. How much is in the account after 5 years?$1,365
  19. $800 earns $224 in simple interest over 8 years. What is the yearly interest rate?3.5%
  20. $2800 at 9% compounded semiannually for 20 years$16285.82

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

How to do these

$2,000 at 3% simple interest for 4 years

  1. 3% is 0.03.
  2. 2000 times 0.03 times 4.
  3. That is the interest; add it to 2000 for the total.

The answer is $240.

Where students go wrong

Using the rate as a whole number, or the time in months. 3% is 0.03, not 3, and 18 months is 1.5 years.

Also called simple interest, I = Prt, simple interest formula or simple and compound interest.

What you can put on this worksheet

The interest earned
A certificate of deposit pays simple interest of 6% a year on $1,200. How much interest is earned in 3 years? → $216
The total in the account
You deposit $1,200 at 6% simple interest a year. How much is in the account after 3 years? → $1,416
Time in months
A loan of $1,200 charges 6% simple interest a year. How much interest is owed after 18 months? → $108
Find the rate, time or principal
$1,200 earns $216 in simple interest over 3 years. What is the yearly interest rate? → 6%
Compared with compounding once a year
$3,500 is invested for 2 years at 10%. How much more does it earn compounded once a year than with simple interest? → $35
Compounded a set number of times a year
$1100 at 5% compounded annually for 8 years → $1625.20

Questions about these worksheets

Yes. Every simple interest sheet is free to print and free to download as a PDF. There is no account to make, no email to hand over and no limit on how many you take.

Yes. The answer key prints on a second page, and you can choose whether it shows each question beside its answer or just the answers in a list.

Yes. Print straight from the page, or download the PDF and print that. The sheet is laid out for paper rather than squeezed off a screen, so there is room to work under each question, and the answer key comes out on its own page.

Algebra 1 is usually taken around 8th or 9th grade, though schools vary and plenty of students meet it earlier or later. Pick the difficulty rather than the grade: the easy level suits a first lesson on it, the hard level suits review before a test.

Yes, as many as you like. The questions are built fresh each time rather than picked from a fixed set of files, so pressing Generate gives a new sheet. That is what you want for a second class, a retake, or two students sitting next to each other.

That is the closest comparison, and Kuta Software is good software. It is also paid software you install on a computer. These worksheets run in a browser tab for free, with no account and nothing to install. Like Kuta, the simple interest questions are generated when you ask for them rather than pulled from a fixed set of files, so two classes never get the same sheet, and the answer key comes with it.

Yes. There are three levels, and you can tick more than one for a sheet that mixes them, in which case the questions come out easiest first. The harder levels are not just larger numbers: they ask for something the easy ones do not.

You pick from 6: the interest earned, the total in the account, time in months, find the rate, time or principal, compared with compounding once a year and compounded a set number of times a year. Tick as many as you want and set how many of each, or let it spread them evenly.

Using the rate as a whole number, or the time in months. 3% is 0.03, not 3, and 18 months is 1.5 years.