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2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

I've Got More Than You

2nd Grade Math

Â» Unit:

Addition and Subtraction Basic Training

Big Idea:Students often think that subtraction is simply âtake away.â The goal of this lesson is to allow students to see the comparison (difference) between two numbers.

The Neighbors of Doubles

2nd Grade Math

Â» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that students can solve for near doubles by thinking of the related doubles fact.

Put It All Together

2nd Grade Math

Â» Unit:

Addition and Subtraction Basic Training

Big Idea:As mathematical thinkers we must use the information from a real world problem and determine what is the correct method to solve the problem.

Step One, Step Two

2nd Grade Math

Â» Unit:

The Action of Subtraction

Big Idea:The big idea of this lesson is that sometimes it may be necessary to answer one problem to help answer another problem.

Thinking Addition Facts to 18 to Subtract

2nd Grade Math

Â» Unit:

The Action of Subtraction

Big Idea:Students apply their understanding of addition to solve related subtraction problems.

Think About Subtracting Nothing

2nd Grade Math

Â» Unit:

The Action of Subtraction

Big Idea:The big idea of this lesson is thinking about subtraction facts with 0, 1, and 2 as amounts less than a number.

Double Trouble

2nd Grade Math

Â» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that students can think about doubles facts as world situations to help commit them to memory.

Subtracting Doubles

2nd Grade Math

Â» Unit:

The Action of Subtraction

Big Idea:The big idea of this lesson is that addition and subtraction facts are related, and every subtraction fact has a related addition fact. Students can think of this inverse relationship when recalling basic subtraction facts.

Riddle Me This... Using Data

2nd Grade Math

Â» Unit:

Each Number Has a Place

Big Idea:The big idea of this lesson is that students will need to use deductive reasoning skills and data to help them solve problems.

Make a Ten, Subtraction Style

2nd Grade Math

Â» Unit:

The Action of Subtraction

Big Idea:The big idea of this lesson is that some subtraction facts can be solved by subtracting from the larger number an amount to get ten and then subtracting the remaining amount.

Think About Related Addition Facts to 10

2nd Grade Math

Â» Unit:

The Action of Subtraction

Big Idea:Students can use their knowledge of using addition to make ten to help them find the related subtraction fact.

More Than Two Numbers

2nd Grade Math

Â» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that three (or more) numbers can be grouped together and added. The order of this grouping doesn't matter.

The Recipe for a Great Word Problem

2nd Grade Math

Â» Unit:

Addition and Subtraction Basic Training

Big Idea:The big idea of this lesson is to have students write their own word problems to help them have a better understanding of mathematical operations, as they relate to real world scenarios.

Addition in the Real World

2nd Grade Math

Â» Unit:

Addition and Subtraction Basic Training

Big Idea:The big idea of this lesson is that we can think of addition in the real world as the joining of two parts to make a whole. The use of addition number sentences can show how we join the parts to make the whole.

Think About Adding Nothing and a Little More

2nd Grade Math

Â» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is the understanding that the number relationships between 0 more than, 1 more than, and 2 more than lay the foundation for the basic addition facts with 0, 1, and 2.

2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.