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Master Perimeter: Grid Squares and Polygons Explained

CA.3.MD.5

Area - unit squares and pattern blocks

Area by Unit Squares

Square measure

Converting Square Units

Calculate the Square Area

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CA.3.MD.6

Calculating and Estimating Area and Perimeter

CA.3.MD.8

Perimeter: Grid squares and polygons

Perimeter of Polygons

Perimeter Equation of Polygons

CA.3.NBT.1

Estimating decimals

Rounding Decimals

Place Value Tables of Multi-Digits

Place Value Tables — Multi-Digit

Identifying the Place Value of a Digit

Place Value of a Digit — Multi-Digits

Expanded Form of Multi-Digits

Place Values in Expanded Form — Up to 10K

Place Values in Expanded Form — Up to 999

Converting Between Place Values of Multi-Digits

Conversions To and From — Up to 9999

Reading and Writing Digits

Reading and Writing Digits — Up to 20

Reading and Writing Digits — Up to 99

Comparing Values of Multi-Digits

Place Value Comparing Numbers — Up to 999

Regrouping Place Values of Multi-Digits

Place Values Regrouping — Up to 999

CA.3.NBT.2

Adding with Digits Up to 1000

Add By Digits — Up to 1000

Simplifying Addition by Separating

Addition by Separation — Up to 1000

Addition by Separation — Up to 999

Addition with Regrouping Up to 1000

Add By Regrouping — Up to 1000

Addition Tables Up to 1000

Add By Number Table — Up to 1000

Subtracting with Digits Up to 1000

Subtract By Digits — Up to 1000

Subtraction with Regrouping Up to 1000

Subtract with Regrouping — Up to 1000

CA.3.NF.3

Equivalent fractions

Equivalent Fractions

CA.3.OA.1

Multiplying Digits with 5 and 10 Up to 999

Multiplication by Five or Ten — Up to 100

Multiplying Digits with 0 and 1 Up to 999

Multiplication by One or Zero — Up to 999

Using Models to Multiply Up to 999

Multiplication by Models — Up to 3 Digits

Multiplying using Mental Strategies

Split into Smaller Calculations Strategy — Up to 999

Repeated Addition As Multiplication Up to 999

Multiplication by Repeated Addition — Up to 999

CA.3.OA.2

Sharing & Grouping Up to 999

Sharing and Partitioning — Up to 3 Digits

Dividing with Arrays

Dividing with Arrays — Up to 100

Remainders from Division Up to 999

Sharing and Remainders — Up to 3 Digits

Dividing with Digits Up to 999

Division By Digits — Up to 3 Digits

Understanding the Division Sign Up to 999

Division Language — Divided By

Division Language — Sharing

CA.3.OA.3

Multiplication Word Problems Up to 999

multiplication word problems up to 999

Division Word Problems Up to 999

Division Word Problems — Up to 3 Digits

CA.3.OA.4

Identifying the Missing Digits (Addition)

Fill in the Blank — Up to 1000

Identifying the Missing Digits (Subtraction)

Multiplication Tables Up to 999

Multiplication Tables — Up to 100

Multiplication Tables — Up to 200

Division Tables Up to 999

Division Tables — Up to 100

Division Tables — Up to 200

CA.3.OA.5

Square Numbers

Square numbers — Up to 100

Relating Multiplication with Division Up to 999

Relating Multiplication with Division

CA.3.OA.6

Relating Addition with Division

CA.3.OA.7

Times Tables

Multiplication Times Table — Up to 2 Digits

Multiplying with Digits Up to 999

Multiplication by Digits — Up to 3 Digits

CA.3.OA.8

Applications of the four operations (BEDMAS without exponents)

Combining Multiplication and Addition

Applying BEDMAS Without Exponents

Addition Word Problems Up to 1000

Addition Word Problems — Up to 1000

Addition Word Problems — Up to 200

Subtraction Word Problems Up to 1000

Subtraction Word Problems — Up to 1000

Multiplying with 3 Numbers Or More

Multiplication of Three or More Numbers

3rd Grade Math

math

Intro

Finding the perimeter of a rectangle on centimeter grid paper

Drawing a different rectangle with the same perimeter of 10 cm

Counting outside edges of a staircase grid shape

Comparing grid squares in shapes with equal perimeters

Counting grid square edges to find perimeter of a shape

Counting grid square edges to find perimeter of an irregular shape

Finding the perimeter of a rectangle on a grid using three formulas

Finding the perimeter of a square using grid edges and formulas

Finding perimeter of a rectangle using grid squares and formulas

Finding the perimeter of a rectangle given length and width

Finding the perimeter of a regular hexagon with 5 cm sides

Finding the side length of a regular octagon from its perimeter

Finding the perimeter of a regular pentagon by adding all sides

Intro to perimeter as the distance around a 2D shape

Calculating the perimeter of a rectangle using side lengths

Perimeter shortcuts for rectangular grid figures

Finding the perimeter of an irregular 5-sided polygon

Finding the perimeter of a regular hexagon in millimeters

In this lesson, we will learn:
<ul type = "disc">
<li>Perimeter is the straight-line measurement of the total distance to trace around a shape</li>
<li>The perimeter of a polygon can be found by adding the lengths of all sides together</li>
<li>The perimeter of a figure made of grid squares is found by tracing around the outside edges only</li>
<li>The formula shortcuts for the perimeter of rectangular figures made of grid squares </li>
</ul>

 Notes: 
<ul type = "disc">
<li>Perimeter is the measurement around the outside of a two-dimensional shape</li>
<ul type = "circle">
<li>For a polygon (shape with straight sides only), the perimeter can be calculated by adding all the sides in the shape together</li>
</ul></ul>

<center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-1-x-1/v1/math4-9-1-x-1-1365w.jpg" width="600" alt="Perimeter: Grid squares and polygons"> </center>

<ul type = "disc">
 <li>Grid squares are building blocks of figures and measure 1cm on all sides. </li>
<ul type = "circle">
<li>To find the perimeter of a shape made of grid squares, count each edge around the OUTSIDE of the shape only.</li>
</ul></ul>

<center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-1-x-2/v1/math4-9-1-x-2-1368w.jpg" width="600" alt="Perimeter: Grid squares and polygons"> </center>

<ul type = "disc">
 <li>If grid squares make a rectangular figure (4-sided polygon with 2 pairs of matching sides), then a short cut can be used for finding the perimeter:</li>
<ul type = "circle">
<li>Perimeter =2 &times; length + (2 &times; width)</li>
<li>OR Perimeter =2 &times; (length + width)</li>
</ul></ul>

<center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-1-x-3/v1/math4-9-1-x-3-1368w.jpg" width="600" alt="Perimeter: Grid squares and polygons"> </center>

Perimeter: grid squares and polygons

Perimeter: Mastering Grid Squares and Polygons

What You'll Learn

Identify perimeter as the total distance around the outside of a 2D shape

Calculate perimeter by adding all side lengths of a polygon together

Count outside edges only when finding perimeter of grid square figures

Apply rectangular perimeter formulas: 2×length + 2×width or 2×(length + width)

Recognize that different shapes can have the same perimeter

What You'll Practice

Counting grid square edges to find perimeter of irregular shapes

Adding all sides to calculate perimeter of polygons like pentagons and hexagons

Using formulas to find perimeter of rectangles with given dimensions

Drawing different rectangles with the same perimeter

Solving for unknown side lengths when perimeter is given

Why This Matters

This Unit Includes

18 Video lessons

Practice exercises

Learning resources

Skills

Perimeter

Grid Squares

Polygons

Rectangles

Measurement

Length and Width

Problem Solving