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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.

The Video Game Model of Adding

3rd Grade Math

Â» Unit:

Multiplication

Big Idea:Video games often dole out points in groups of 25, 50 and 100 because they are easy numbers to multiply. Practice with patterns of 5 and 10 apply directly to understanding patterns with 50 and 100.

Open Number Line - Decomposed Factors

3rd Grade Math

Â» Unit:

Multiplication

Big Idea:Open number lines are a model for mathematical thinking that can be used in multiplication and division, as well as addition and subtraction.

Open Number Lines - Just the Basics

3rd Grade Math

Â» Unit:

Multiplication

Big Idea:Open number lines are a model for mathematical thinking that can be used in multiplication and division, as well as addition and subtraction.

Patterns in a Table

3rd Grade Math

Â» Unit:

Fun with Multiplying and Dividing

Big Idea:Pattern recognition is a critical skill in math, and life. Learning to look for and analyze patterns helps students learn how to use what they know, to solve what they don't.

Big Groups and Big Products

3rd Grade Math

Â» Unit:

2-Digit by 1-Digit Multiplication

Big Idea:Big groups and big products can be broken apart into smaller groups of tens and ones to make it easier to multiply and find the product

Multiply and Divide by 10

3rd Grade Math

Â» 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.

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

3rd Grade Math

Â» 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).

Addition Patterns

3rd Grade Math

Â» Unit:

Patterns in Math

Big Idea:When students make their own meaning out of patterns they learn content through an individualized lens.

Patterns In Multiplication (Days 1 - 5)

3rd Grade Math

Â» Unit:

Multiplication 2

Big Idea:As students develop fluency finding and explaining patterns with products helps them make sense of multiplication.

Multiplying by 9

3rd Grade Math

Â» Unit:

Fluency to Automoticity

Big Idea:Children will explore the multiples of 9, use patterns in the multiplication equations, and learn a finger trick to become more fluent in quickly multiplying using 9.

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

3rd Grade Math

Â» 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).

Palindromes

3rd Grade Math

Â» Unit:

Review for Testing

Big Idea:Students use addition skills and knowledge of properties to find sums that result in a palindrome when two numbers are added together.

Everyone Try It! (Equal & Opposite Change)

3rd Grade Math

Â» Unit:

Addition and Subtraction

Big Idea:Don't be afraid to teach struggling students an alternative method; sometimes it can provide a breakthrough!

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

3rd Grade Math

Â» Unit:

Addition and Subtraction

Big Idea:An alternative approach can increase understanding of regrouping!

Subtraction - Equal Change- Stations (1)

3rd Grade Math

Â» Unit:

Addition and Subtraction

Big Idea:Alternative algorithms open up doors to productive alternative thinking.

3.OA.D.8

Solve 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.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.