Calculate (4/6)³: Solving a Cubed Fraction Expression

Exponent Rules with Fraction Bases

Insert the corresponding expression:

(42×3)3= \left(\frac{4}{2\times3}\right)^3=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:03 According to the laws of exponents, a fraction raised to a power (N)
00:07 equals the numerator and denominator, each raised to the same power (N)
00:11 We will apply this formula to our exercise
00:17 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(42×3)3= \left(\frac{4}{2\times3}\right)^3=

3

Final Answer

43(2×3)3 \frac{4^3}{\left(2\times3\right)^3}

Key Points to Remember

Essential concepts to master this topic
  • Exponent Rule: When raising a fraction to a power, raise both numerator and denominator
  • Technique: (42×3)3=43(2×3)3 \left(\frac{4}{2\times3}\right)^3 = \frac{4^3}{(2\times3)^3}
  • Check: Verify that both 4 and (2×3) are raised to the 3rd power ✓

Common Mistakes

Avoid these frequent errors
  • Only applying the exponent to the numerator
    Don't raise just the numerator to the power like 432×3 \frac{4^3}{2\times3} = wrong result! This ignores the exponent rule for fractions and gives an incorrect simplified form. Always raise both the numerator AND denominator to the given power.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why do I need to raise both the top and bottom to the 3rd power?

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When you raise a fraction to a power, you're multiplying the entire fraction by itself that many times. So (46)3=46×46×46=4363 \left(\frac{4}{6}\right)^3 = \frac{4}{6} \times \frac{4}{6} \times \frac{4}{6} = \frac{4^3}{6^3}

What's the difference between (4/6)³ and 4³/6?

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(46)3=4363=64216 \left(\frac{4}{6}\right)^3 = \frac{4^3}{6^3} = \frac{64}{216} , but 436=646 \frac{4^3}{6} = \frac{64}{6} . The parentheses mean the exponent applies to the entire fraction!

Should I simplify 2×3 first before applying the exponent?

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You can do either! (42×3)3=(46)3=4363 \left(\frac{4}{2\times3}\right)^3 = \left(\frac{4}{6}\right)^3 = \frac{4^3}{6^3} or 43(2×3)3 \frac{4^3}{(2\times3)^3} . Both are correct, but the second form matches the given expression exactly.

How do I know which answer choice is right?

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Look for the choice where both parts of the fraction are raised to the 3rd power. Only 43(2×3)3 \frac{4^3}{(2\times3)^3} shows this correctly - the others forgot to raise the denominator to the 3rd power.

Can I calculate the final numerical answer?

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Yes! 43(2×3)3=64216=827 \frac{4^3}{(2\times3)^3} = \frac{64}{216} = \frac{8}{27} when simplified. But since the question asks for the expression, not the simplified form, keep it as 43(2×3)3 \frac{4^3}{(2\times3)^3} .

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