into your calculator. To do so you press 5 . 8 7 1 3. (The < and > simply indicate that the button is labeled with the letters in between. Do not look for a < and > button.) If your calculator does not have a button labeled EE then you likely enter this number by pressing, 5 . 8 7 1 3. Again do not press the buttons , , , , or the keys . If you use any of these you will likely get the wrong answer!