# Intro to Rational Numbers

## Overview

A **rational number** is any number that can be made by dividing two integers. Examples of rational numbers include integers, fractions, and decimals.

Rational numbers include **negative numbers**. Negative numbers are numbers that

come before **0** on the number line.

Why would we need negative numbers?

Many measurements, including temperature, elevation, and electric charge use negative numbers.

**For example:**

Stacy checks the weather in the morning. According to her app, it’s **-2 °C**. She checks the weather again in the afternoon. The app now says it’s **5°C**. Is it warmer or colder in the afternoon?

We can see on the number line that **5** is greater than **-2**. What if we want to know

how many degrees warmer it is in the afternoon?

We can count the spaces in between the numbers. We can see that the temperature was **7°C** higher in the afternoon.

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Use the chart to answer this question. The chart represents lowest temperatures

in different cities during the month of February.

Represent the temperatures on the number line below.

Use the chart to answer this question. The chart represents lowest temperatures

in different cities during the month of February.

What does **0** represent on the number line in question 1?

The zero represents 0 Degrees Celsius.

Use the chart to answer this question. The chart represents lowest temperatures

in different cities during the month of February.

How many degrees warmer is the lowest temperature in Dallas compared to the lowest temperature in Buffalo?

12

Count the spaces between the two locations on the number line.

in different cities during the month of February.

How many degrees cooler is the lowest temperature in Philadelphia compared

to the lowest temperature in Charlotte?

2

Count the spaces between the two locations on the number line.

in different cities during the month of February.

Which city had the coldest day in February?

Buffalo

Look for the city that’s the farthest to the left on the number line.

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