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Master Perimeter: Grid Squares and Polygons Explained

TX.3.2.A

Place Value Tables of Multi-Digits

Place Value Tables — Multi-Digit

Expanded Form of Multi-Digits

Place Values in Expanded Form — Up to 10K

Place Values in Expanded Form — Up to 999

Regrouping Place Values of Multi-Digits

Place Values Regrouping — Up to 999

TX.3.2.B

Identifying the Place Value of a Digit

Place Value of a Digit — Multi-Digits

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

TX.3.2.C

Subtraction using Estimation

Subtract By Estimation — Up to 1000

TX.3.2.D

Comparing Values of Multi-Digits

Place Value Comparing Numbers — Up to 999

TX.3.3.F

Equivalent fractions

Equivalent Fractions

TX.3.3.H

Comparing and Ordering Fractions

Comparing Fractions

Ordering Fractions

TX.3.4.A

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

TX.3.4.B

Addition using Estimation

Add By Estimation — Up to 1000

TX.3.4.C

Recognizing coins and bills

Name the Coin by Picture

Name the Coin by Value

Coin Values by Name

TX.3.4.E

Using Models to Multiply Up to 999

Multiplication by Models — Up to 3 Digits

Repeated Addition As Multiplication Up to 999

Multiplication by Repeated Addition — Up to 999

TX.3.4.F

Times Tables

Multiplication Times Table — Up to 2 Digits

Relating Multiplication with Division Up to 999

Relating Multiplication with Division

Division Tables Up to 999

Division Tables — Up to 100

Division Tables — Up to 200

TX.3.4.G

Multiplying using Mental Strategies

Split into Smaller Calculations Strategy — Up to 999

Multiplying with Digits Up to 999

Multiplication by Digits — Up to 3 Digits

TX.3.4.H

Sharing & Grouping Up to 999

Sharing and Partitioning — Up to 3 Digits

TX.3.4.I

Even and odd numbers

Recognizing Even Numbers

Recognizing Odd Numbers

TX.3.4.K

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

TX.3.5.B

Dividing with Arrays

Dividing with Arrays — Up to 100

TX.3.5.D

Identifying the Missing Digits (Addition)

Fill in the Blank — Up to 1000

Identifying the Missing Digits (Subtraction)

Dividing with Digits Up to 999

Division By Digits — Up to 3 Digits

TX.3.5.E

Showing patterns in T-tables

Patterns in T-tables Next 2 Patterns

Patterns in T-tables Ascending

T-table Patterns Ascending – Word Problem

T-table Patterns Descending – Word Problem

Patterns in T-tables Next 2 patterns

TX.3.6.C

Area - unit squares and pattern blocks

Area by Unit Squares

Square measure

Converting Square Units

Calculate the Square Area

Calculating and Estimating Area and Perimeter

TX.3.7.B

Perimeter: Grid squares and polygons

Perimeter of Polygons

Perimeter Equation of Polygons

3rd Grade Math

Algebraic Reasoning

Data Analysis

Geometry and Measurement

Number and Operations

Personal Financial Literacy

math

Intro

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