# Problem Solving

### Using UPSL to differentiate between addition and subtraction

Examine the bar graph below.

How many more days did it rain in June than in August?

## What does it mean to examine the graph?

Let's find out...

## Key Points

- All graphs have a title.

*Rainy Days*

## Key Points

- All graphs represent a collection of data.

*The key tells us that the maroon bars represent the number of days it rained.*

## Key Points

- The left side of this bar graph tells us when the data was collected

*The months of May, June, July, and August*

## Key Points

- The bottom of this bar graph shows us the amount.

*The number of days it rained, each line represents 2 days.*

How many days in May did it rain? June? July? August?

** ALWAYS** write it on the graph.

## Now that we have examined the graph we can begin our UPSL strategy to solve the problem!

## How to Justify your Answer with College Readiness

__Ask yourself the following questions__- What operation did you use to solve the problem?
- Why?

*I used ___________________ to solve the problem because_______________________.*

- Does your answer make sense?

*I wanted to know ____________________________________________. By______________ (Continue by explaining the work you completed) I determined that ________________________ (the answer).*

- How do you know?

*I know this is correct because__________________________________.*