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Master Area and Perimeter Estimation with Unit Squares

CA.3.MD.5

Area - unit squares and pattern blocks

Area by Unit Squares

Square measure

Converting Square Units

Calculate the Square Area

auto-gen

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

Estimating area by counting full and half unit squares

Calculating approximate area by rounding partial unit squares

Counting whole, half, and partial squares to estimate area

Estimating area by counting full squares and half triangles

Finding length, width, perimeter, and area of rectangles on grid paper

Comparing perimeter and area across four rectangles

Estimating area of an irregular figure using grid squares and triangles

Estimating area of an irregular shape using full squares and half squares

Intro to estimating area using unit squares and half-square triangles

Estimating area using half-square rounding on a grid

Estimating area of an irregular shape using unit square rounding

In this lesson, we will learn:
<ul type = "disc">
<li>How to count areas with squares and/or triangles (unit squares and half unit squares)</li>
<li>How to estimate areas of shapes on an area grid</li>
</ul>

 Notes: 
<ul type = "disc">
<li>Review: finding perimeter and area for rectangular figures</li>
</ul>

<center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-4-x-1/v1/math4-9-4-x-1-1376w.jpg" width="600" alt="Calculating and Estimating Area and Perimeter"> </center>

<ul type = "disc">
 <li>How do you find the area of shapes that are not made of squares?
</li>
<ul type = "circle">
<li>If you cut a square diagonally, you will get a triangle (half a square is a triangle)
</li>
</ul></ul>

<center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-4-x-2/v1/math4-9-4-x-2-1376w.jpg" width="600" alt="Calculating and Estimating Area and Perimeter"> </center>

<ul type = "circle">
<ul type = "circle">
<li>If you cut 2 squares diagonally (2 cm2), you will get half the area (1 cm2)
</li>
<li>There are other variations of getting half of a square (1/2 cm2 or 0.5 cm2)
</li>
<li>There will also be cases where you won&apos;t know the exact amount shaded in one square, but you can say whether it is more or less than half
</li>
</ul></ul>

 <center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-4-x-3/v1/math4-9-4-x-3-889w.jpg" width="600" alt="Calculating and Estimating Area and Perimeter"> </center>

<ul type = "disc">
 <li>To estimate areas of a shape on a grid, we can get close to the actual area by:</li>
<ul type = "circle">
<li>Counting all the whole unit squares (fully shaded in or covered by the shape)
</li>
<li>Counting all the half unit squares (most commonly the diagonal triangle)</li>
<li>Rounding any squares shaded more than half up to \(\approx\) 1 cm2</li>
<li>Rounding any squares shaded less than half down to \(\approx\) 0 cm2</li>
</ul></ul>

<center><img src="https://dmn92m25mtw4z.cloudfront.net/img_set/math4-9-4-x-4/v1/math4-9-4-x-4-1378w.jpg" width="600" alt="Calculating and Estimating Area and Perimeter"> </center>

Calculating and estimating area and perimeter

Strategies for estimating area and perimeter with unit squares

Estimating Area and Perimeter: Mastering Unit Square Techniques

What You'll Learn

Count area using whole unit squares and half unit squares (triangles)

Identify squares shaded in more than half and less than half

Apply rounding strategies to estimate areas of irregular shapes on grids

Calculate perimeter by tracing outside edges of grid squares

Recognize that half of two unit squares equals one whole unit square

What You'll Practice

Counting whole, half, and partial unit squares on grid paper

Estimating areas by rounding squares shaded more or less than half

Calculating perimeter and area for rectangular figures

Comparing shapes with the same perimeter or area but different dimensions

Why This Matters

This Unit Includes

11 Video lessons

Learning resources

Skills

Area

Perimeter

Unit Squares

Estimation

Grid Paper

Measurement

Spatial Reasoning