## NY-1.OA.3: Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

There are 161 resources.
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## Math Video Definitions Collection: Elementary Addition and Subtraction (Spanish audio)

Addition Expressions and Equations This collection aggregates all the video definitions around the topic of elementary addition and subtraction. There are a total of 50 videos. These videos have Spanish audio. This collection of resources is made up of downloadable MP4 files that you can easily incorporate into a presentation.

## Math Video Definitions Collection: Elementary Addition and Subtraction

Addition Expressions and Equations This collection aggregates all the video definitions around the topic of elementary addition and subtraction. There are a total of 50 videos. This collection of resources is made up of downloadable MP4 files that you can easily incorporate into a presentation.

## Math Games Collection: Drag-N-Drop

### Overview

Addition Facts to 25, Counting, Subtraction Facts to 25, Place Value, Polynomial Expressions, Division Expressions and Equations, Point-Slope Form, Slope-Intercept Form, Standard Form, Slope, Applications of Linear Functions, Quadratic Equations and Functions, Data Analysis, Multiplication Expressions and Equations, Solving One-Step Equations, Quadratic Formula, Numerical Expressions, Variable Expressions and Solving Two-Step Equations This is a collection of all our drag-n-drop math games. There are a total of 34 games.

## Math Games Collection: Jeopardy

Addition Facts to 25, Addition Facts to 100, Subtraction Facts to 100, Add and Subtract Fractions, Graphs of Linear Functions, Slope-Intercept Form, Graphs of Quadratic Functions and Numerical and Algebraic Expressions Overview
This is a collection of all our Jeopardy math games. There are a total of 7 games.

## Math Definitions Collection: Elementary Math Terms for Addition and Subtraction

Addition Expressions and Equations This collection aggregates all the definition image cards around the topic of Elementary Math Terms for Addition and Subtraction. There are a total of 26 terms.

## Math Video Collection: Counting

### Overview This collection aggre

Counting, Addition Facts to 25 and Subtraction Facts to 25 This collection aggregates all the math videos and resources in this series: Counting. There are a total of 18 resources.

## Math Worksheet Collection: The Language of Math

Place Value, Addition Facts to 25, Addition Facts to 100, Numerical and Algebraic Expressions, Numerical Expressions, Variable Expressions, Fractions and Mixed Numbers, Subtraction Facts to 25 and Subtraction Facts to 100 This collection aggregates all the math worksheets around the topic of the Language of Math, or converting words into math expressions. There are a total of 264 worksheets.

## Closed Captioned Video: Counting and Addition

### Closed Captioned Video: Counting and Addition In this video tutorial, students are shown how to use their counting skills to add two numbers. Three worked-out examples provide an opportunity for students to see how to use their counting skills to add.

Addition Facts to 25 and Counting

## Closed Captioned Video: Counting and Subtraction

### Closed Captioned Video: Counting and Subtraction In this video tutorial, students are shown how to use their counting skills to subtract two numbers. Three detailed examples show how to use counting to subtract.

Counting and Subtraction Facts to 25

## Definition--Math Properties--Associative Property of Addition

### Definition--Math Properties--Associative Property of Addition This is part of a collection of definitions of math properties. These downloadable images can easily be incorporated into a lesson plan.

Numerical Expressions

## Definition--Math Properties--Commutative Property of Addition

### Definition--Math Properties--Commutative Property of Addition This is part of a collection of definitions of math properties. These downloadable images can easily be incorporated into a lesson plan.

Numerical Expressions