OA 
Operations and Algebraic Thinking

Represent and solve problems
involving addition and subtraction.

2.OA.A.1

Use
addition and subtraction within 100 to solve one and twostep 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.

Add and subtract within 20.

2.OA.B.2

Fluently
add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all
sums of two onedigit numbers.

NBT – Number and Operation in Base Ten

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

2.NBT.B.5

Fluently
add and subtract within 100 using strategies based on place value,
properties of operations, and/or the relationship between addition and
subtraction.


Enduring Understandings:
·
Numbers
help to answer everyday questions, such as, “how many” and “how much”.
·
Numbers
can be thought about and used in different ways.
·
Numbers
can be shown in all kinds of ways.
·
There
is more than one way to solve a problem.
·
Addition
and subtraction are related operations.
·
Numbers
can be composed and decomposed.
·
Knowing
basic facts helps to solve other problems efficiently.

Essential Questions:
·
What are different ways we can show or make (represent) a
number?
·
Why do
I use numbers to show “how much” and “how many”?
·
How can
I solve the same problem in more than one way?
·
How are
addition and subtraction opposite operations?
·
How can
I compose and decompose a number?
·
How can
I use the basic facts to solve other problems?
