You see, we have the number range listed on the left and the logarithm range listed on the right. Now in the bad old days before calculators, you would have to learn to use a set of logarithm tables to find the logarithm of our number, 1.3, that we asked for earlier. But nowadays, you can get it at the press of a button on your calculator. I'm going to take a moment to discuss your calculator. If you don't have a calculator with scientific functions on it, you should get one before proceeding in this tutorial since the rest depends on it.
Most calculators are very straightforward in obtaining the logarithm.
They either have two logarithm keys or a dual function key. Log is the key for logs to the base 10 and ln is for natural logs. Enter 1.3 on your calculator, and then press the log key. You should have. You should have 0.838849 for the log of 6.9.