Math Problem Statement

Find the least number by which 8232 must be divided to obtain a perfect cube write the cube root of the number so obtained

Solution

To solve this problem, we need to find the smallest number by which 8232 must be divided to obtain a perfect cube, and then find the cube root of the resulting number.

Step 1: Prime Factorization of 8232

We begin by performing the prime factorization of 8232:

8232÷2=41168232 \div 2 = 4116 4116÷2=20584116 \div 2 = 2058 2058÷2=10292058 \div 2 = 1029 1029÷3=3431029 \div 3 = 343 343=73343 = 7^3

Thus, the prime factorization of 8232 is: 8232=23×3×738232 = 2^3 \times 3 \times 7^3

Step 2: Identify Missing Factors to Make a Perfect Cube

For a number to be a perfect cube, the exponents of all its prime factors must be multiples of 3. In the prime factorization of 8232, we see:

  • 232^3 is already a cube.
  • 313^1 is not a cube (it needs two more factors of 3).
  • 737^3 is already a cube.

So, we need to divide by 33 (to remove the extra factor of 3) to make it a perfect cube.

Step 3: Divide 8232 by 3

82323=2744\frac{8232}{3} = 2744

Step 4: Find the Cube Root of 2744

Now, we find the cube root of 2744: 27443=14\sqrt[3]{2744} = 14

Conclusion:

  • The least number by which 8232 must be divided to obtain a perfect cube is 3.
  • The cube root of the resulting number (2744) is 14.

Would you like further clarification or additional details?

Here are 5 related questions to deepen your understanding:

  1. How is the prime factorization method useful in determining perfect cubes?
  2. What happens if a number's prime factors all have exponents that are multiples of 3?
  3. How would you find the least number to multiply by, instead of divide, to get a perfect cube?
  4. What other methods can be used to check if a number is a perfect cube?
  5. How can you apply this method to much larger numbers?

Tip: When checking for perfect cubes, always ensure that the exponents in the prime factorization are divisible by 3.

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Math Problem Analysis

Mathematical Concepts

Number Theory
Prime Factorization
Perfect Cubes
Cube Roots

Formulas

Prime Factorization
Cube Root Formula: \( \sqrt[3]{x} \)

Theorems

For a number to be a perfect cube, the exponents in its prime factorization must be multiples of 3.

Suitable Grade Level

Grades 6-8