Calculate 1/12³: Solving a Cube Fraction Problem

Negative Exponents with Fractional Forms

1123=? \frac{1}{12^3}=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:04 Let's solve this problem together.
00:07 Remember, for exponents, if we have a number, A, raised to the power of negative N...
00:13 ...we get one divided by A to the power of positive N.
00:18 Let's use this rule to change from number to fraction, and back.
00:23 So, twelve to the power of negative three becomes...
00:27 ...one over twelve to the power of three. And that's how it's done!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

1123=? \frac{1}{12^3}=\text{?}

2

Step-by-step solution

To begin with, we must remind ourselves of the Negative Exponent rule:

an=1an a^{-n}=\frac{1}{a^n} We apply it to the given expression :

1123=123 \frac{1}{12^3}=12^{-3} Therefore, the correct answer is option A.

3

Final Answer

123 12^{-3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: 1an=an \frac{1}{a^n} = a^{-n} converts fractions to negative exponents
  • Technique: Transform 1123 \frac{1}{12^3} directly to 123 12^{-3}
  • Check: Both forms equal 11728 \frac{1}{1728} when calculated ✓

Common Mistakes

Avoid these frequent errors
  • Confusing negative exponents with negative numbers
    Don't think 123=123 12^{-3} = -12^3 = -1728! A negative exponent means reciprocal, not negative value. Always remember an=1an a^{-n} = \frac{1}{a^n} , which gives positive results for positive bases.

Practice Quiz

Test your knowledge with interactive questions

\( 112^0=\text{?} \)

FAQ

Everything you need to know about this question

What does a negative exponent actually mean?

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A negative exponent means "take the reciprocal and use the positive exponent." So 123=1123 12^{-3} = \frac{1}{12^3} . It's like flipping the fraction!

Why is 123 12^{-3} the same as 1123 \frac{1}{12^3} ?

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This is the negative exponent rule! When you have an a^{-n} , it equals 1an \frac{1}{a^n} . They're just two different ways to write the same mathematical value.

How do I calculate 123 12^3 to check my answer?

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123=12×12×12=144×12=1728 12^3 = 12 \times 12 \times 12 = 144 \times 12 = 1728 . So 1123=11728 \frac{1}{12^3} = \frac{1}{1728} , which confirms our answer!

Is 123 12^{-3} a positive or negative number?

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It's positive! The negative sign in the exponent doesn't make the result negative. 123=11728 12^{-3} = \frac{1}{1728} is a small positive fraction.

Can I leave my answer as 11728 \frac{1}{1728} instead?

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Both 123 12^{-3} and 11728 \frac{1}{1728} are correct! However, 123 12^{-3} is often preferred because it shows the relationship to the original expression more clearly.

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