4th Grade Math

Fractions, decimals, and geometric concepts for fourth grade students.

Understanding FractionsDecimals and Place ValueShapes and Geometry Basics
Equivalent FractionsAdding and Subtracting FractionsExploring 3D Shapes
Fractions and Decimals in CookingGeometry in Building and DesignMoney Matters: Decimals in Everyday Life
Break Down Big ProblemsCheck Your Work With Estimation
Understanding Fracti...Decimals and Place V...Shapes and Geometry ...Equivalent FractionsAdding and Subtracti...Exploring 3D ShapesFractions and Decima...Geometry in Building...Money Matters: Decim...Break Down Big Probl...Check Your Work With...
Advanced Topics

Adding and Subtracting Fractions

How Do We Add or Subtract Fractions?

To add or subtract fractions, they must have the same denominator. This is called a common denominator.

  • If denominators are the same, just add or subtract the numerators.
  • If denominators are different, find a common denominator first.

Steps for Adding Fractions

  1. Check if denominators are the same.
  2. If not, find a common denominator.
  3. Add the numerators.
  4. Keep the denominator the same.

Steps for Subtracting Fractions

  1. Make denominators the same.
  2. Subtract the numerators.
  3. Keep the denominator the same.

Why Is This Useful?

Adding and subtracting fractions helps with cooking, building, and sharing things equally!

Real-World Uses

  • Adding ingredient amounts in a recipe
  • Sharing snacks between friends

Examples

  • Adding \( \frac{1}{4} + \frac{2}{4} = \frac{3}{4} \).

  • Subtracting \( \frac{3}{5} - \frac{1}{5} = \frac{2}{5} \).

In a Nutshell

Add or subtract fractions by making their denominators the same.

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Exploring 3D Shapes