## What you’ll learn to do: Simplify and evaluate expressions involving the subtraction of integers

Do you ever compare the weather where you are with the weather where your friends or family members live? Imagine that it’s winter, and you call your parents in Chicago from your house in Los Angeles, where the temperature is [latex]65[/latex] degrees. They tell you that the temperature in Chicago, where you grew up, is [latex]-2[/latex] degrees. What’s the difference in temperature between the two cities? To find out, you’ll need to subtract integers, which you’ll learn how to do in this section.

Before you get started in this module, try a few practice problems and review prior concepts.

### readiness quiz

1)

If you missed this problem, review the following video.

2)

If you missed this problem, review the following video.

3)

If you missed this problem, review the following video.

### Candela Citations

- Chicago during the Polar Vortex.
**Authored by**: edward stojakovic.**Located at**: https://www.flickr.com/photos/akasped/11808898455/.**License**:*CC BY: Attribution* - Ex: Evaluate an Expression Using the Order of Operations.
**Authored by**: James Sousa (Mathispower4u.com).**Located at**: https://youtu.be/qFUvF5-w9o0.**License**:*CC BY: Attribution* - Write Algebraic Expressions from Statements: Form ax+b and a(x+b).
**Authored by**: James Sousa (Mathispower4u.com).**Located at**: https://youtu.be/Hub7ku7UHT4.**License**:*CC BY: Attribution* - Ex 1: Adding Integers.
**Authored by**: James Sousa (Mathispower4u.com).**Located at**: https://youtu.be/6jdp2Vl6pt8.**License**:*CC BY: Attribution* - Question ID: 144748, 144916, 145013.
**Authored by**: Lumen Learning.**License**:*CC BY: Attribution*.**License Terms**: IMathAS Community License CC-BY + GPL

- Prealgebra.
**Provided by**: OpenStax.**License**:*CC BY: Attribution*.**License Terms**: Download for free at http://cnx.org/contents/caa57dab-41c7-455e-bd6f-f443cda5519c@9.757