3.OA.D.9

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- 3.OA.D.8Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.
- 3.OA.D.9Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.

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## 3.OA.D.9

## Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.

18 Lesson(s)

### The Video Game Model of Adding

3rd Grade Math »
Unit: Multiplication

3rd Grade Math »
Unit: Multiplication

### Open Number Line - Decomposed Factors

3rd Grade Math »
Unit: Multiplication

3rd Grade Math »
Unit: Multiplication

### Open Number Lines - Just the Basics

3rd Grade Math »
Unit: Multiplication

3rd Grade Math »
Unit: Multiplication

### Patterns in a Table

3rd Grade Math »
Unit: Fun with Multiplying and Dividing

3rd Grade Math »
Unit: Fun with Multiplying and Dividing

### Big Groups and Big Products

3rd Grade Math »
Unit: 2-Digit by 1-Digit Multiplication

3rd Grade Math »
Unit: 2-Digit by 1-Digit Multiplication

### Multiply and Divide by 10

3rd Grade Math »
Unit: Fluency to Automoticity

3rd Grade Math »
Unit: Fluency to Automoticity

Big Idea:

#### Counting by 10's is easy for students of this age. Knowing that base 10 can be used to help multiply and divide in the higher numbers by decomposing is critical. This lesson sets the base for future work.

Favorites
(2)

Resources
(12)

Reflections
(1)

### Tell Me A 2 by 1 Digit Multiplication Story (Lesson 1 of 2)

3rd Grade Math »
Unit: 2-Digit by 1-Digit Multiplication

3rd Grade Math »
Unit: 2-Digit by 1-Digit Multiplication

Big Idea:

#### Students use two numbers to create a multiplication word problem, demonstrating the solution using a visual model matching their strategy choice (equal groups, arrays or repeated addition).

Favorites
(9)

Resources
(13)

Reflections
(2)

### Tell Me a 2 by 1 Digit Multiplication Story (Lesson 2 of 2)

3rd Grade Math »
Unit: 2-Digit by 1-Digit Multiplication

3rd Grade Math »
Unit: 2-Digit by 1-Digit Multiplication

Big Idea:

#### Students use two numbers to create a multiplication word problem, demonstrating the solution using a visual model matching their strategy choice (equal groups, arrays or repeated addition).

Favorites
(3)

Resources
(8)

Reflections
(1)

### Patterns In Multiplication (Days 1 - 5)

3rd Grade Math »
Unit: Multiplication 2

3rd Grade Math »
Unit: Multiplication 2

### Multiplying by 9

3rd Grade Math »
Unit: Fluency to Automoticity

3rd Grade Math »
Unit: Fluency to Automoticity

### Everyone Try It! (Equal & Opposite Change)

3rd Grade Math »
Unit: Addition and Subtraction

3rd Grade Math »
Unit: Addition and Subtraction

### Subtraction - Equal Change- Stations (1)

3rd Grade Math »
Unit: Addition and Subtraction

3rd Grade Math »
Unit: Addition and Subtraction

### Subtraction - The Equal Change Algorithm- It's Fun!

3rd Grade Math »
Unit: Addition and Subtraction

3rd Grade Math »
Unit: Addition and Subtraction

Common Core Math

### Kindergarten

### First Grade

### Second Grade

### Third Grade

### Fourth Grade

### Fifth Grade

### Sixth Grade

### Seventh Grade

### HS Number & Quantity

### HS Algebra

### HS Functions

### HS Geometry

### Kindergarten

### First Grade

### Second Grade

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### Sixth Grade

### Seventh Grade

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### Ninth and Tenth Grade

### Kindergarten

### First grade

### Second grade

### Third Grade

### Fourth grade

### Fifth grade

### Middle School

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

HS Number & Quantity

HS Algebra

HS Functions

HS Geometry

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

Eighth Grade

Ninth and Tenth Grade

Kindergarten

First grade

Second grade

Third Grade

Fourth grade

Fifth grade

Middle School