# 2nd Grade Math Videos

### Operations and Algebraic Thinking

A. Represent and solve problems involving addition and subtraction.

B. Add and subtract within 30.

Make a Ten to Add on an Open Number Line

2.OA.B.2

Fluently add and subtract within 30 using mental strategies. By the end of 2nd grade, know from memory all sums of two one-digit numbers and related subtraction facts.

Ready Math Lesson 1 & 3

Make a Ten to Subtract on an Open Number Line

2.OA.B.2

Fluently add and subtract within 30 using mental strategies. By the end of 2nd grade, know from memory all sums of two one-digit numbers and related subtraction facts.

Ready Math Lesson 1 & 3

Use Addition & Counting On to Subtract

2.OA.B.2

Fluently add and subtract within 30 using mental strategies. By the end of 2nd grade, know from memory all sums of two one-digit numbers and related subtraction facts.

Ready Math Lesson 1

C. Work with equal groups of objects to gain foundations for multiplication.

### Number and Operations in Base Ten

A. Understand place value.

B. Use place value understanding and properties of operations to add and subtract.

Make a Ten to Add with 2-digit Numbers

2.NBT.B.5

Add within 100

Ready Math Lesson 7

Using Addition to Subtract on an Open Number Line

2.NBT.B.5

Use place value understanding and properties of operations to add and subtract

Ready Math Lesson 8

Add Tens & Ones Using Place Value

2.NBT.B.7

Add and subtract within 1000 using strategies based on place value, properties of operations

Ready Math Lesson 7

Add Tens & Ones Using Base Ten Blocks

2.NBT.B.7

Add and subtract within 1000 using concrete models

Ready Math Lesson 7

Adding Up on an Open Number Line

2.NBT.B.7

Use place value to add within 100

Ready Math Lesson 7 & 13

Subtraction by Counting Back and Using Addition

2.NBT.B.5

Use place value understanding and properties of operations to add and subtract

Ready Math Lesson 8

Subtraction with Regrouping

2.NBT.B.5

Use place value understanding and properties of operations to add and subtract

Ready Math Lesson 8

### Measurement and Data

A. Measure and estimate lengths in standard units.

B. Relate addition and subtraction to length.

C. Work with time and money.

D. Represent and interpret data.

### Geometry

A. Reason about shapes and their attributes.