Calculate (2/3)³: Finding the Cube of a Fraction

Fraction Powers with Cube Exponents

What is the result of the following power?

(23)3 (\frac{2}{3})^3

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's solve this expression together.
00:08 The power tells us how many times to multiply the base by itself.
00:14 Multiply the number by itself as many times as the power shows.
00:19 Tackle each multiplication step-by-step.
00:23 Remember, multiply the top numbers together, then the bottom ones.
00:29 And there you have it, that's the solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What is the result of the following power?

(23)3 (\frac{2}{3})^3

2

Step-by-step solution

To solve the given power expression, we need to apply the formula for powers of a fraction. The expression we are given is:
(23)3 \left(\frac{2}{3}\right)^3

Let's break down the steps:

  • When we raise a fraction to a power, we apply the exponent to both the numerator and the denominator separately. This means raising both 2 and 3 to the power of 3.
  • Thus, we calculate:
    23=8 2^3 = 8 and 33=27 3^3 = 27 .
  • Therefore, (23)3=2333=827 \left(\frac{2}{3}\right)^3 = \frac{2^3}{3^3} = \frac{8}{27} .

So, the result of the expression (23)3 \left(\frac{2}{3}\right)^3 is 827 \frac{8}{27} .

3

Final Answer

827 \frac{8}{27}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Apply exponent to both numerator and denominator separately
  • Technique: Calculate 2³ = 8 and 3³ = 27 individually
  • Check: Verify (2/3)³ = 8/27 by multiplying 2/3 × 2/3 × 2/3 ✓

Common Mistakes

Avoid these frequent errors
  • Only applying the exponent to the numerator
    Don't calculate 2³/3 = 8/3! This ignores the denominator completely and gives a wrong answer. Always raise both the numerator AND denominator to the given power: (a/b)ⁿ = aⁿ/bⁿ.

Practice Quiz

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\( 100+5-100+5 \)

FAQ

Everything you need to know about this question

Why do I need to cube both the top and bottom numbers?

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When you raise a fraction to a power, you're multiplying the entire fraction by itself multiple times. So (2/3)³ means (2/3) × (2/3) × (2/3), which requires cubing both parts.

Can I simplify 8/27 any further?

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No, 8/27 is already in its simplest form! Since 8 = 2³ and 27 = 3³ share no common factors, this fraction cannot be reduced.

What if the exponent was negative, like (2/3)⁻³?

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For negative exponents, flip the fraction first, then apply the positive exponent: (2/3)⁻³ = (3/2)³ = 27/8.

How can I check my work without a calculator?

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Multiply step by step: (2/3) × (2/3) = 4/9, then (4/9) × (2/3) = 8/27. This confirms your answer!

Does this rule work for any fraction and any exponent?

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Yes! The rule (a/b)ⁿ = aⁿ/bⁿ works for all fractions and all integer exponents, whether positive or negative.

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