Math Problem Statement

can one do this without using calculator

Solution

Yes, you can estimate log1036\log_{10}{36} without a calculator by using logarithm properties and approximations for known logarithms. Here's how you might do it:

Step 1: Break Down 36 into Factors

First, express 36 as a product of numbers whose logarithms are easier to calculate: 36=6×6=(2×3)×(2×3)=22×3236 = 6 \times 6 = (2 \times 3) \times (2 \times 3) = 2^2 \times 3^2

Step 2: Apply Logarithm Properties

Use the logarithm property: log10(a×b)=log10a+log10b\log_{10}(a \times b) = \log_{10}a + \log_{10}b This gives: log1036=log10(22×32)=log1022+log1032\log_{10}{36} = \log_{10}(2^2 \times 3^2) = \log_{10}{2^2} + \log_{10}{3^2}

Step 3: Use Logarithm Powers

Apply the property log10ab=blog10a\log_{10}{a^b} = b \log_{10}{a}: log1036=2log102+2log103=2(log102+log103)\log_{10}{36} = 2\log_{10}{2} + 2\log_{10}{3} = 2(\log_{10}{2} + \log_{10}{3})

Step 4: Approximate Logarithms of 2 and 3

Now, use the approximate values for log102\log_{10}{2} and log103\log_{10}{3}: log1020.3010andlog1030.4771\log_{10}{2} \approx 0.3010 \quad \text{and} \quad \log_{10}{3} \approx 0.4771 So: log10362(0.3010+0.4771)=2(0.7781)=1.5562\log_{10}{36} \approx 2(0.3010 + 0.4771) = 2(0.7781) = 1.5562

Conclusion

This matches the value we found earlier, log10361.5563\log_{10}{36} \approx 1.5563.

Would you like to explore more logarithm properties or have any further questions?


Here are 5 related questions for further practice:

  1. How can you approximate log1050\log_{10}{50} using logarithm properties?
  2. What is log104\log_{10}{4} if you know log102\log_{10}{2}?
  3. How does the logarithmic scale work for measuring sound (decibels)?
  4. Can you express log1072\log_{10}{72} using logarithms of smaller numbers?
  5. What is the inverse operation of finding a logarithm?

Tip: Knowing a few key logarithm values, like log102\log_{10}{2} and log103\log_{10}{3}, allows you to estimate many logarithms without a calculator!

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Math Problem Analysis

Mathematical Concepts

Logarithms

Formulas

Logarithm property: \( \log_{10}(a \times b) = \log_{10}a + \log_{10}b \)
Logarithm power property: \( \log_{10}(a^b) = b \log_{10}a \)

Theorems

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Suitable Grade Level

High School