Decimals
Decimals are everywhere: prices, metric measurements, test scores, and data. The key to mastering them is understanding place value and how decimals connect to fractions and percents. Start with a big-picture reference, then use interactive tools to visualize, convert, and practice decimal operations.
Learning Path
Fractions, Decimals & Percents
Get a quick visual overview of how decimals connect to fractions and percentages, plus the place-value ideas behind them.
Open →Decimal Grids & Tenths/Hundredths Explorer
See decimals as shaded grids to build intuition for tenths, hundredths, and equivalent decimal values.
Open →Decimal Operations Mission Lab
Practice adding, subtracting, multiplying, and dividing decimals in a guided, hands-on mission format.
Open →Decimal Operations Reference
Use this as a quick desk-side guide when you need a reminder.
- Line up decimal points when adding or subtracting.
- Use place value to compare, round, and estimate decimal values.
- Convert between decimals, fractions, and percents to check your work.
More Resources
Tools
Labs
Worksheets
Cheat Sheets
Infographics
Explainers
Mnemonics
Common Questions
What is a decimal?
A decimal is a way to write a number that includes parts of a whole using place value, such as tenths, hundredths, and thousandths.
Why are decimals useful?
Decimals make it easy to express money, measurements, and precise values, and they help connect fractions and percents in everyday math.