# Common Core: 1st Grade Math : Representing and Solving Addition and Subtraction Problems

## Example Questions

### Example Question #21 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Molly has  pencils and Natalie has . How many total pencils do they have if they put theirs together?

Explanation:

This is an addition problem because Molly and Natalie are putting their pencils together, and they will have more once they put all the pencils together.

We can start at  and count up .

### Example Question #21 : Representing And Solving Addition And Subtraction Problems

Tracy picked  strawberries from a bush in her yard, and  strawberries from her neighbors bush. How many strawberries does she have?

Explanation:

This is an addition problem because Tracy has two groups of strawberries that she is putting together into one group. When you put things together you are adding.

We can start at  and count up .

### Example Question #131 : Operations & Algebraic Thinking

Zack ate  pieces of chocolate at lunch and  pieces of chocolate after dinner. How many pieces did he eat?

Explanation:

This is an addition problem because we want to know the total number of pieces of chocolate that Zack ate, we are putting the pieces together that he had at lunch and after dinner. When we put things together we are adding.

We can start at  and count up .

### Example Question #132 : Operations & Algebraic Thinking

The toy store has  black balls and  red balls. How many total balls do they have?

Explanation:

This is an addition problem because we are putting the red bals and the black balls together. When we put things together we are adding.

We can start at  and count up .

### Example Question #133 : Operations & Algebraic Thinking

Lucy is packing a bag for a trip. So far she has  t-shirts and  pairs of shorts.  How many pieces of clothing does she have all together?

Explanation:

This is an addition problem because we are putting the shirts and the shorts together. When we put things together we are adding.

We can start at  and count up .

### Example Question #1051 : Operations

Jeff needs to collect leaves for a school project. He picked up  leaves in his front yard and  leaves in his backyard. How many leaves has he collected?

Explanation:

This is an addition problem because we are putting the leaves that Jeff collected in the front yard together with the leaves he collected in the backyard. When we put things together we are adding.

We can start at  and count up .

### Example Question #21 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

Tom and Tim both have piggy banks in their rooms. Tom has  coins in his piggy bank and Tim has . How many coins do they have if they put their coins together?

Explanation:

This is an addition problem because Tim and Tom are putting their coins together. When we put things together we are adding.

We can start at  and count up .

### Example Question #22 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

A furniture store has  tables for sale and  chairs for sale. How many total things do they have for sale?

Explanation:

This is an addition problem because we are putting the table and chairs together. When we put things together we are adding.

We can start at  and count up .

### Example Question #132 : Common Core Math: Grade 1

A candy store has  blue gumballs and  yellow gumballs. How many total gumballs  does the store have?

Explanation:

This is an addition problem because we are putting the blue and the yellow gumballs together. When we put things together we are adding.

We can start at  and count up .

### Example Question #21 : Addition And Subtraction Within 20 To Solve Word Problems: Ccss.Math.Content.1.Oa.A.1

The rose bush has  hot pink roses and  light pink roses. How many total roses does the bush have?