Learn the basics of addition with this free lesson, which includes addition basics as well as interactives for you to practice.

### What is addition?

**Addition** is a way to put things together. When you **add** two amounts, you're counting them together, as one larger amount. Addition happens all the time in real life.

For instance, if this rabbit has babies ...

For instance, if this rabbit has babies ... she's **adding **to her family.

We can **count** the number of rabbits to find out how many there are.

We can **count** the number of rabbits to find out how many there are.

We can **count** the number of rabbits to find out how many there are.

We can **count** the number of rabbits to find out how many there are.

The total is 4. If you have 1 mother rabbit and 3 babies, you have 4 rabbits total.

What if there were** four more** rabbits?

As you can see, if you have **4** rabbits and add **4 **more, you'll have **8 **rabbits in total. You could write it like this:

4 + 4 = 8

4 + 4 = 8 is a **mathematical equation**. You could read it like this: Four plus four equals eight. A mathematical equation is basically a **math sentence**. It uses numbers and **symbols** instead of words. When we write out equations with addition, we use two symbols: **+** and** =**.

The **plus sign** (**+**) means two things are being added together. This is why we put it between the rabbits—we had 4 rabbits and added 4 more.

The other symbol in our equation is the **equals** **sign** (**=**). When you see the equals sign in an equation, it means two are more things are **equal**, or **equivalent**. Things that are equivalent don't always look or seem exactly alike, but they mean the same thing.

For instance, when you see someone you know, there's a few things you might say:

These words aren't exactly alike, but they mean the same thing. They're all ways to greet someone.

In math, the equals sign shows that two numbers or expressions **mean the same thing**, even though they might look different. Remember our rabbits? Because there were 8 rabbits total, we wrote 8 to the right of the equals sign.

See how each side means 8? There are 8 rabbits on the left, and the number 8 on the right. Both sides are **equal**.

#### Try This!

Fill in the blanks to complete the equations.