Basic Math

Fundamental mathematical operations and concepts for everyday use.

Addition and SubtractionMultiplication and DivisionUnderstanding Numbers and Place Value
Working with FractionsDecimals and PercentagesOrder of Operations
Budgeting and Money MathCooking and MeasurementsTelling Time and Schedules
Estimation and Mental MathWord Problem Solving
Addition and Subtrac...Multiplication and D...Understanding Number...Working with Fractio...Decimals and Percent...Order of OperationsBudgeting and Money ...Cooking and Measurem...Telling Time and Sch...Estimation and Menta...Word Problem Solving
Advanced Topics

Decimals and Percentages

Going Beyond Whole Numbers

Decimals and percentages are ways to show numbers smaller than one or parts of a whole.

Decimals

Decimals use a dot (.) to separate the whole number from the part.

  • 0.5 is half, just like \( \frac{1}{2} \).
  • 2.75 means 2 whole and 75 hundredths.

Percentages

Percentages are fractions out of 100. The symbol "%" means "per hundred."

  • 25% means 25 out of 100, or \( \frac{25}{100} \).

Everyday Uses

You see decimals in money ($3.50) and percentages in sales (20% off) all the time!

Examples

  • Paying $1.99 for a snack at the store.

  • Getting 80% correct on a quiz.

In a Nutshell

Decimals and percentages help express parts of a whole in a different way.

Key Terms

Decimal
A number that shows values less than one using a dot.
Percent
A way to express a number as parts out of 100.
Next
Order of Operations