# Adding and Subtracting Within 10

## What Must Be Learned?

Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem.

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.

## 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.”

## Center Groups

Teacher Center:

- Addition and subtraction problems with manipulatives

- Addition and subtraction problems with drawings

- Addition and subtraction problems with number lines

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:

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

## Assessment

Students will be given 4 short word problems at the end of the unit (see pictures below). They may ask for assistance in reading the word problems. Students will use manipulatives or drawings to help in solving the word problems. They will take pictures of each part of their solving process. The pictures will then be put into a Educreations so students can voiceover the photos to describe how they solved each problem.