# Adding and Subtracting Within 10

### K.OA.A.2

## What Must Be Learned?

Students should be able to solve four different types of problems within 10: Result Unknown/Add To; Result Unknown/Take From; Total Unknown/Put Together-Take Apart; and Addend Unknown/Put Together-Take Apart.

## Guided Math

## (Start with Whole Group Introduction)

## Whole Group Introduction

Teacher will begin to introduce the concept of addition and subtraction with visuals.

__Example #1:__

“I have two circles.” (Show two circles to class)

“I’m going to put another circle with them.” (add an additional circle to the previous two)

“How many circles do I have now? Let’s count the circles all together: one, two, three. I now have three circles.”

__Example #2:__

“I have seven pencils in my hand.” (Show seven pencils to class)

“I’m going to take away two of the pencils.” (Move two pencils off to the side)

“How many pencils do I have now? Let’s count the pencils that are left in my hand: one, two, three, four, five. I now only have five pencils.”## (Then Break Into Center Groups)

## Center Groups

**Teacher Center:**

- Addition and subtraction problems with manipulatives

- Addition and subtraction problems with drawings

- Addition and subtraction problems with number lines

- Addition/ Subtraction Story mats

**Teacher Assistant Center:**

- Create flower garden with number sentences--use different colored petals to create an addition sentence (3 pink petals + 2 yellow petals = 5 petals on the flower)

- Create Number Stories together.

- Create Number Stories with assistance.

- Addition/subtraction Card Sort – students sort cards into three categories: the answer is less than 5, equal to 5, or more than 5.

**Technology Practice Center: **Goals to be practiced on www.ixl.com:

__Addition__

I.1 Addition with pictures - sums up to 5

I.2 Add two numbers - sums up to 5

I.3 Addition sentences - sums up to 5

I.4 Ways to make a number - sums up to 5

I.5 Addition word problems - sums up to 5

I.6 Addition with pictures - sums up to 10

I.7 Add two numbers - sums up to 10

I.8 Addition sentences - sums up to 10

I.9 Ways to make a number - sums up to 10

I.10 Addition word problems - sums up to 10

I.11 Addition sentences - sums equal to 10

__Subtraction__

J.1 Subtract with pictures - numbers up to 5

J.2 Subtraction - numbers up to 5

J.3 Subtraction sentences - numbers up to 5

J.4 Subtraction word problems - numbers up to 5

J.5 Subtract with pictures - numbers up to 10

J.6 Subtraction - numbers up to 9

J.7 Subtraction sentences - numbers up to 10

J.8 Subtraction word problems - numbers up to 9