Simple & Compound Interest Worksheets

What the Simple & Compound Interest Worksheets Generator does

This tool produces ready-to-print word problems that ask students to calculate interest on invested or borrowed money. In simple interest mode, each problem gives a principal, an annual rate, and a time in years, and asks for the interest and the total amount using I = P·R·T. In compound interest mode, problems specify a compounding frequency (annually, semi-annually, quarterly, or monthly) and ask for the final amount and the interest earned using A = P(1 + r/n)^(n·t). Mixed mode blends both so students must first decide which formula applies.

The two formulas at a glance

• Simple interest: I = P × R × T, where P is the principal, R is the annual rate (as a decimal or percent), and T is the time in years. The total amount is A = P + I.
• Compound interest: A = P(1 + r/n)^(n·t), where n is the number of times interest is compounded per year and t is the time in years. The compound interest earned is A − P.

The generator keeps the numbers realistic — principals from a few hundred to several thousand dollars and rates between 2% and 10% — so answers stay believable and the arithmetic stays manageable.

What you can customise

• Mode: simple, compound, or mixed word problems on one sheet.
• Problem count: 4 to 30 questions per worksheet.
• Answer key: toggle a second page showing the final amount and interest to two decimal places for fast marking.
• Name & date fields: add a header line for classroom use, or remove it for a clean look.
• Title: keep the default heading or set your own.

How to use the tool

1. Choose your mode: simple, compound, or mixed.
2. Set how many problems you want on the sheet.
3. Decide whether to include the worked answer key.
4. Pick A4 or US Letter paper.
5. Click Download to save your branded PDF, then print and distribute.

Who these worksheets are for

Teachers

Financial literacy and percentage topics appear in most middle-school and high-school curricula. Use simple-interest sheets to introduce the idea, then move to compound interest and finally a mixed sheet as an assessment where students must choose the right formula themselves.

Parents and homeschoolers

Interest is one of the most practical maths skills a teenager can learn — it underpins savings accounts, loans, and credit cards. Generate fresh problems whenever your child needs more practice, and use the answer key to check work without recomputing every exponent by hand.

Students revising independently

Each new sheet gives different numbers, so you can drill until the method is automatic. Self-mark with the answer key and note whether errors come from the formula, the rate conversion, or rounding.

Worked example

Consider a compound-interest problem: $2,000 is invested at 6% per year compounded quarterly for 3 years. Here P = 2000, r = 0.06, n = 4, and t = 3, so A = 2000(1 + 0.06/4)^(4×3) = 2000(1.015)^12 ≈ $2,391.24, and the interest earned is about $391.24. The answer key rounds both figures to two decimal places so students can confirm their calculator work.

Simple vs compound: why the difference matters

With simple interest the amount grows in a straight line — the same interest is added each year. With compound interest each period earns interest on the previous interest, so the balance grows faster and the more frequent the compounding, the larger the final amount. Comparing the two on a mixed sheet helps students see why compounding is powerful for savers and costly for borrowers.

Designed for A4 and US Letter printing

The layout fits both A4 (210 × 297 mm) and US Letter (8.5 × 11 in) without clipping. Long word problems wrap automatically and each question leaves a ruled line for working. Margins, headers, and footers adjust to the paper size so you can print on any home or office printer with no manual scaling.