Common Core: 3rd Grade Math

Explore the foundational concepts of mathematics through engaging activities and problem-solving strategies designed for 3rd graders.

Place Value and Number SenseAddition and Subtraction StrategiesIntroduction to Multiplication
Division and Relationship to MultiplicationFractions as NumbersUnderstanding Area and Perimeter
Math in ShoppingTelling Time and Reading ClocksSolving Real-World Problems
Drawing and ModelingChecking Your Work and Estimating
Place Value and Numb...Addition and Subtrac...Introduction to Mult...Division and Relatio...Fractions as NumbersUnderstanding Area a...Math in ShoppingTelling Time and Rea...Solving Real-World P...Drawing and ModelingChecking Your Work a...
Advanced Topics

Understanding Area and Perimeter

Measuring Area and Perimeter

Area tells us how much space is inside a shape. Perimeter is the distance around the shape.

Area

  • To find the area of a rectangle, multiply its length by its width: \( \text{Area} = \text{length} \times \text{width} \)

Perimeter

  • Add up the lengths of all the sides of a shape.

Why Area and Perimeter Matter

These measurements help us figure out things like how much carpet to buy or how much fence we need.

Key Formula

\[Area = l \times w\]

Examples

  • A rectangle with sides 4 and 6 has area 24 (4 × 6) and perimeter 20 (4 + 6 + 4 + 6).

  • You need to know perimeter to put a fence around a garden.

In a Nutshell

Area measures space inside; perimeter measures distance around.

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Math in Shopping