Fraction · Decimal · Percent
Build a fraction and instantly see it as a decimal and a percent, with a 100-square grid showing exactly how much it is.
About the Fraction · Decimal · Percent
Students tend to learn fractions, decimals, and percents as three separate units, then struggle to connect them when a problem suddenly switches between forms. This tool sets one fraction with a numerator and denominator slider and shows its decimal and percent equivalents side by side, alongside a 100-square grid shaded to match the percent.
Eight common fractions — halves, quarters, thirds, fifths, tenths — sit as quick-access buttons, which makes it fast to build a reference chart of the conversions students are expected to know automatically.
How to use it in your classroom
- Drag the numerator and denominator sliders to set a fraction, or click one of the common-fraction buttons below them.
- Read the shaded 100-square grid, where the green cells represent the percent equivalent out of 100.
- Check the three result panels for the reduced fraction, the decimal, and the percent, all generated from the same value.
- Adjust the denominator first if you want to explore equivalent fractions, since the numerator slider's range updates to match.
Tips from the classroom
- Set the denominator to 100 first so the grid lines up one cell per percentage point, then have students predict the percent before you change the numerator.
- Use the common-fraction buttons to build a quick reference chart on the board for fractions students are expected to memorize, like 1/2, 1/4, and 1/10.
- Pick a denominator that doesn't divide evenly into 100 (like 3 or 7) to show students that not every fraction converts to a clean percent.
- Have students estimate the percent from the grid's shading before reading the exact number in the result panel — it's a quick check on whether they understand what percent represents.
Frequently asked questions
What's the largest denominator I can use?
20. That keeps the fraction model and the grid both readable while still covering most denominators students encounter in elementary and middle school work.
Does the decimal value round, or is it exact?
It's rounded to four decimal places, which is enough precision to show repeating or long decimals without the display becoming unreadable.
Why does the grid sometimes show a partial cell as either filled or empty?
The grid rounds the percent to the nearest whole cell, since a 100-square grid can only represent whole percentage points. The exact percent value in the panel below it is not rounded the same way.