**Terms **are made up of letters or numbers or a mixture of both.

**Examples**

3m

-5d

6

7b^{3}

An **expression** is made up of terms added together, such as **4m - 5 + 6d ^{2}** which is made up of

**3 terms**

**Coefficients **are simply the numbers which appear before letters in an algebraic term.

**Examples**

The coefficient of 3m is 3

The coefficient of -5d is -5

The coefficient of -2d^{3} is -2