Q&A for How to Use Logarithmic Tables

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How do I find the log of a cube?

Donagan

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Triple the log of the number that has been cubed.

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Question

How do I find logs for 3.14?

Community Answer

Multiply 3.14 with 10 to get 31.4, then find log (31.4), which is roughly 1.4969. Now, divide this by 10 to get your log with base 10.

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Question

How do I find the log of a single digit?

Community Answer

Say you want to find the log of 9. You know that 9 = 9.0 = 9.00 and so on. Now that you have the correct number of significant digits, you can use a log table as long as you deal with decimal points correctly.

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Question

How can one find the log of 3.5?

Community Answer

3.5 = 3.50 (with as many 0's as you want.) You now have enough significant digits to follow method 2 in the article.

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Question

If I have divided numbers using log, then how do I use an antilog?

Community Answer

As long as the quotient is an exponent, you can use the normal method to find the antilog.

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How do we find the logarithm of 2000?

Community Answer

Find the log 2000=.1585. Then add 3 as 2000 is between 1000 and 10000. Answer is 3.1585.

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Question

How can I make my own log table when I don't have a log book?

Community Answer

Choose the base you want to use. Write the numbers 10-99 down the left side and the numbers 0-9 across the top. Use a calculator or spreadsheet to calculate the log for each space in the table.

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Question

How do I find log(0.0046)?

Community Answer

You can express this as 46 x 10 to the power -3. The next step is to find log(46), then multiply it with 10 to the power -3.

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Question

How do I find the cube of 288 using the logarithmic tables?

Balaaji Selvanathan

Community Answer

288^1/3 = x 1/3 log(288)=log x 1/3(2.459)=log x 0.819=log x x=Al(0.819)=6.603(approx)

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Question

How do I find anti-log -3.746?

Joab Kalyegira

Community Answer

Express the log as negative characteristic minus the mantissa -3-0.746. Subtract 1 from characteristic and add one to the mantissa in order to make it positive; if you're using a log table, -3 - 1 - 0.746 + 1. Write the result as a log having a negative characteristic and a positive mantissa -4 + 0.254. Then use the log table to find the anti-log. Anti-log of -3.746 is 1.795x10^-4 = 0.0001795.

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Question

How can I find the value of -log 34?

Community Answer

Multiply it with 10 and make it 3.4 and you will get 10 raised to the power of 1, now find log 34 which is 1.531 and the approximate answer is 1.1531.

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Question

How do I calculate the log of 0.1/0.01?

Community Answer

0.1/0.01 is 10 and the common logarithm of 10 is, of course, 10. Be sure to simplify the problem if you can.

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Question

How do I use the log table to find the log of 150?

Community Answer

Find the log of 15, then add 1 to it. Just use method 1 in the article to find log 15.

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Question

How to find log of more than 4 digit numbers?

Community Answer

Use the identity log(ac) = log(a) + log(c). For example, log(1876) = log(18.76*100) = log(18.76) + log(100) = log(18.76) + 2. Use the table to find log(18.76) and add two, and there is your answer.

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How do I find the log that's a negative power?

Community Answer

Multiply the whole radical by the given power. For example, log 10^(-3)=(-3)log 10.

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Question

How do I divide 176 by 1024 using a logarithmic table?

Community Answer

Find the log of both these numbers, then subtract them. And then find the antilog of the number you get. That'll be your answer.

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Question

How do I find the log of a mixed number?

Community Answer

First, convert the mixed number into a fraction, then convert into a decimal. Then repeat the steps above.

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