Log Tables - Numberphile
Logarithms and log tables - what Professor Bowley used before calculators! More on this: http://youtu.be/vzV50goW_WM More links & stuff in full description below ↓↓↓ Professor Roger...
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ROGER BOWLEY: I'm going to be talking about logarithms, logarithms to the base 10. So for example, if I have a number, which is 100, I can think of that as 10 squared, or 10 to the power 2. So 2 is the logarithm of this number, 100, to the base 10. 1,000 is 10 to the 3. This is the logarithm, the 3, and it corresponds to the number of 0's there. It is logarithm of 1,000 equals 3. I can do 10 to another number. So for example, 10 to the 1.6232 turns out to be 42. That means that if I were to take 10, that means that the log to the base 10 of 42 is 1.6232 to four significant figures. The reason it's useful is multiplication. If I have two numbers and I want to multiply them together, it's easy to make mistakes, because there are a lot o...
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ROGER BOWLEY: I'm going to be talking about logarithms, logarithms to the base 10. So for example, if I have a number, which is 100, I can think of that as 10 squared, or 10 to the power 2. So 2 is the logarithm of this number, 100, to the base 10. 1,000 is 10 to the 3. This is the logarithm, the 3, and it corresponds to the number of 0's there. It is logarithm of 1,000 equals 3. I can do 10 to another number. So for example, 10 to the 1.6232 turns out to be 42. That means that if I were to take 10, that means that the log to the base 10 of 42 is 1.6232 to four significant figures. The reason it's useful is multiplication. If I have two numbers and I want to multiply them together, it's easy to make mistakes, because there are a lot o...
