We use the EXP or EE button on a calculator to enter numbers written in standard index form.

For a negative index, we must use the +/- or the (-) key before entering the index number.

**Example:**

To enter 3.67 x 10^{14}, press the following keys:

3.67

EXP

14

To enter 1.29 x 10^{-4}, press the following keys:

1.29

EXP

+/- or (-)

4

Notice how your calculator displays numbers in standard form.

1.29 11 or 1.29 E11

is 1.29 x 10^{11} not 1.29^{11}

**Now let's put your knowledge to the test!**