# Lesson 4 Result or Change Unknown

Let’s solve story problems and write equations to match.

## Warm-up True or False: Equations with 10

Is each statement true or false? Be prepared to explain your reasoning.

## Activity 1 Compare the Problems

Mai has 5 graphic novels.

She checks out 4 more.

How many graphic novels does she have?

Show your thinking using drawings, numbers, or words.Equation:

Mai has 5 graphic novels.

She checks out some more.

Now she has 9 graphic novels.

How many graphic novels did she check out?

Show your thinking using drawings, numbers, or words.Equation:

## Activity 2 Story Problems about Books

Mai has read 3 books about dogs.

Diego gives her 4 more books to read.

How many books about dogs will Mai read all together?

Show your thinking using drawings, numbers, or words.Equation:

Noah has 4 books of poetry.

His sister gives him some more books.

Now he has 10 books of poetry.

How many books did his sister give him?

Show your thinking using drawings, numbers, or words.Equation:

Tyler has 7 books about spiders.

He gives 3 of his books to Kiran.

How many books does Tyler have left?

Show your thinking using drawings, numbers, or words.Equation:

Lin has 5 books about outer space.

Her teacher gives her some more books.

Now she has 10 books about outer space.

How many books did Lin’s teacher give her?

Show your thinking using drawings, numbers, or words.Equation:

## Practice Problem

## Problem 1

There were 3 students on the playground.

Some more students came to the playground.

Now there are 9 students on the playground. How many students came to the playground?

Show your thinking using drawings, numbers, or words.

Equation: