# Algebra I/Content/Introduction to Basic Algebra Ideas/Simple Operations

Back to Table of Contents Algebra I

## Contents

## Vocabulary

Operation

Equals Sign

Adding

Subtracting

Multiplying

Dividing

## Lesson

An ''*operation " is a thing you do to numbers. You use signs like:*

**+**,

**-**,

*****, or

**/**for operations.

The **Equals Sign** is not an operation. You use the " **=** " sign for the Equals Sign. It is a special sign that you put between two things that are the same.

### Adding

Adding is a way to put two numbers together. You use the " **+** " sign for the adding operation. If you have 5 apples and a friend has 6 apples, you and your friend have 11 apples. This is **5 + 6 = 11** using the signs of Math.

Order is not important when adding. **2 + 3** is the same as **3 + 2**.

### Subtracting

Subtracting is a way of taking a number out from an other number. It is the opposite of adding. You use the " **-** " sign for the subtracting operation. If you have 5 apples and give 3 to a friend, you then have 2 apples. This is **5 - 3 = 2** using the signs of Math.

Order is important when subtracting. **3 - 2** is not the same as **2 - 3**.

### Multiplying

Multiplying is a way of adding a number many times. You use the " **×** " sign for the multiplying operation. If you have 4 apple trees and every tree has 25 apples, you have 100 apples. This is **4 × 25 = 100** or **25 + 25 + 25 + 25 = 100** in the signs of Math. The first way is shorter and easier to use.

Multiplying 25 by 4 is the same as adding 25, 4 times or adding 4, 25 times.

Order is not important when multiplying. **2 × 3** is the same as **3 × 2**.

### Dividing

Dividing is the opposite of multiplying. You use the " **/** " sign for the dividing operation. If 3 friends take an equal part of a bag of 12 apples, every friend gets 4 apples. This is **12 / 3 = 4** in the signs of Math.

Order is important when dividing. **3 / 2** is not the same as **2 / 3**.

## Example Problems

3 + 4 = 7

5 - 3 = 2

6 × 2 = 12

13 + 14 = 27

21 - 9 = 12

8 × 3 = 24

14 / 2 = 7

## Practice Games

## Practice Problems

- 75 / 5 =
- 12 * 3 =
- 18 + 5 =
- 90 - 75 =
- 7 + 6 =