The Concept of Multiplication of Fractions

Oct 13, 2025 by wbrum.org 67 views

Understanding the Problem

To find $\frac{8}{9}$ of $\frac{3}{8}$ , we need to understand the concept of multiplication of fractions. Multiplication of fractions involves multiplying the numerators together and the denominators together. This is a fundamental concept in mathematics, and it is essential to grasp it to solve problems involving fractions.

The Concept of Multiplication of Fractions

When we multiply two fractions, we multiply the numerators together and the denominators together. This can be represented as follows:

$\frac{a}{b} \times \frac{c}{d} = \frac{a \times c}{b \times d}$

In this formula, $a$ and $b$ are the numerator and denominator of the first fraction, and $c$ and $d$ are the numerator and denominator of the second fraction.

Applying the Concept to the Problem

Now that we understand the concept of multiplication of fractions, we can apply it to the problem at hand. We need to find $\frac{8}{9}$ of $\frac{3}{8}$ . Using the formula for multiplication of fractions, we can write this as:

$\frac{8}{9} \times \frac{3}{8} = \frac{8 \times 3}{9 \times 8}$

Simplifying the Expression

Now that we have the expression in the form of a fraction, we can simplify it. To simplify a fraction, we need to find the greatest common divisor (GCD) of the numerator and the denominator. The GCD is the largest number that divides both the numerator and the denominator without leaving a remainder.

Finding the Greatest Common Divisor (GCD)

To find the GCD of 24 and 72, we can list the factors of each number and find the greatest common factor.

Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24 Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

The greatest common factor of 24 and 72 is 24.

Simplifying the Fraction

Now that we have found the GCD, we can simplify the fraction by dividing both the numerator and the denominator by the GCD.

$\frac{8 \times 3}{9 \times 8} = \frac{24}{72}$

Further Simplification

We can further simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor, which is 24.

$\frac{24}{72} = \frac{1}{3}$

Conclusion

Therefore, $\frac{8}{9}$ of $\frac{3}{8}$ is $\frac{1}{3}$ .

Answer

The correct answer is C. $\frac{1}{3}$ .

Discussion

This problem requires a basic understanding of multiplication of fractions and simplification of fractions. It is essential to grasp these concepts to solve problems involving fractions. The problem also requires the ability to find the greatest common divisor (GCD) of two numbers and to simplify a fraction by dividing both the numerator and the denominator by the GCD.

Practice Problems

Find $\frac{9}{10}$ of $\frac{2}{3}$ .
Find $\frac{7}{8}$ of $\frac{3}{4}$ .
Find $\frac{5}{6}$ of $\frac{4}{9}$ .

Solutions to Practice Problems

Find $\frac{9}{10}$ of $\frac{2}{3}$ . $\frac{9}{10} \times \frac{2}{3} = \frac{9 \times 2}{10 \times 3} = \frac{18}{30} = \frac{3}{5}$
Find $\frac{7}{8}$ of $\frac{3}{4}$ . $\frac{7}{8} \times \frac{3}{4} = \frac{7 \times 3}{8 \times 4} = \frac{21}{32}$
Find $\frac{5}{6}$ of $\frac{4}{9}$ . $\frac{5}{6} \times \frac{4}{9} = \frac{5 \times 4}{6 \times 9} = \frac{20}{54} = \frac{10}{27}$

Frequently Asked Questions

Q: What is the formula for multiplication of fractions?

A: The formula for multiplication of fractions is:

$\frac{a}{b} \times \frac{c}{d} = \frac{a \times c}{b \times d}$

Q: How do I simplify a fraction after multiplying?

A: To simplify a fraction after multiplying, you need to find the greatest common divisor (GCD) of the numerator and the denominator. Then, divide both the numerator and the denominator by the GCD.

Q: What is the greatest common divisor (GCD)?

A: The greatest common divisor (GCD) is the largest number that divides both the numerator and the denominator without leaving a remainder.

Q: How do I find the GCD of two numbers?

A: To find the GCD of two numbers, you can list the factors of each number and find the greatest common factor.

Q: What is the difference between multiplication and addition of fractions?

A: Multiplication of fractions involves multiplying the numerators together and the denominators together, whereas addition of fractions involves adding the numerators together and keeping the same denominator.

Q: Can I multiply a fraction by a whole number?

A: Yes, you can multiply a fraction by a whole number. To do this, multiply the numerator of the fraction by the whole number and keep the denominator the same.

Q: Can I multiply two whole numbers?

A: Yes, you can multiply two whole numbers. To do this, multiply the two numbers together.

Q: What is the result of multiplying two negative numbers?

A: The result of multiplying two negative numbers is a positive number.

Q: What is the result of multiplying a positive number and a negative number?

A: The result of multiplying a positive number and a negative number is a negative number.

Q: Can I multiply a fraction by a decimal?

A: Yes, you can multiply a fraction by a decimal. To do this, convert the decimal to a fraction and then multiply.

Q: Can I multiply a decimal by a fraction?

A: Yes, you can multiply a decimal by a fraction. To do this, convert the fraction to a decimal and then multiply.

Q: What is the result of multiplying a fraction by a percentage?

A: The result of multiplying a fraction by a percentage is a fraction that represents a percentage of the original fraction.

Q: Can I multiply a fraction by a mixed number?

A: Yes, you can multiply a fraction by a mixed number. To do this, convert the mixed number to an improper fraction and then multiply.

Q: Can I multiply two mixed numbers?

A: Yes, you can multiply two mixed numbers. To do this, convert the mixed numbers to improper fractions and then multiply.

Q: What is the result of multiplying two improper fractions?

A: The result of multiplying two improper fractions is an improper fraction that represents the product of the two fractions.

Q: Can I multiply a fraction by a variable?

A: Yes, you can multiply a fraction by a variable. To do this, multiply the numerator of the fraction by the variable and keep the denominator the same.

Q: Can I multiply two variables?

A: Yes, you can multiply two variables. To do this, multiply the two variables together.

Q: What is the result of multiplying two variables with different exponents?

A: The result of multiplying two variables with different exponents is a variable with an exponent that is the sum of the exponents of the two variables.

Q: Can I multiply a fraction by a polynomial?

A: Yes, you can multiply a fraction by a polynomial. To do this, multiply the numerator of the fraction by the polynomial and keep the denominator the same.

Q: Can I multiply two polynomials?

A: Yes, you can multiply two polynomials. To do this, multiply each term of the first polynomial by each term of the second polynomial and then combine like terms.

Q: What is the result of multiplying two polynomials with different degrees?

A: The result of multiplying two polynomials with different degrees is a polynomial with a degree that is the sum of the degrees of the two polynomials.

Q: Can I multiply a fraction by a rational expression?

A: Yes, you can multiply a fraction by a rational expression. To do this, multiply the numerator of the fraction by the rational expression and keep the denominator the same.

Q: Can I multiply two rational expressions?

A: Yes, you can multiply two rational expressions. To do this, multiply each term of the first rational expression by each term of the second rational expression and then combine like terms.

Q: What is the result of multiplying two rational expressions with different degrees?

A: The result of multiplying two rational expressions with different degrees is a rational expression with a degree that is the sum of the degrees of the two rational expressions.

Q: Can I multiply a fraction by a trigonometric expression?

A: Yes, you can multiply a fraction by a trigonometric expression. To do this, multiply the numerator of the fraction by the trigonometric expression and keep the denominator the same.

Q: Can I multiply two trigonometric expressions?

A: Yes, you can multiply two trigonometric expressions. To do this, multiply each term of the first trigonometric expression by each term of the second trigonometric expression and then combine like terms.

Q: What is the result of multiplying two trigonometric expressions with different degrees?

A: The result of multiplying two trigonometric expressions with different degrees is a trigonometric expression with a degree that is the sum of the degrees of the two trigonometric expressions.

Q: Can I multiply a fraction by a logarithmic expression?

A: Yes, you can multiply a fraction by a logarithmic expression. To do this, multiply the numerator of the fraction by the logarithmic expression and keep the denominator the same.

Q: Can I multiply two logarithmic expressions?

A: Yes, you can multiply two logarithmic expressions. To do this, multiply each term of the first logarithmic expression by each term of the second logarithmic expression and then combine like terms.

Q: What is the result of multiplying two logarithmic expressions with different bases?

A: The result of multiplying two logarithmic expressions with different bases is a logarithmic expression with a base that is the product of the bases of the two logarithmic expressions.

Q: Can I multiply a fraction by a exponential expression?

A: Yes, you can multiply a fraction by an exponential expression. To do this, multiply the numerator of the fraction by the exponential expression and keep the denominator the same.

Q: Can I multiply two exponential expressions?

A: Yes, you can multiply two exponential expressions. To do this, multiply each term of the first exponential expression by each term of the second exponential expression and then combine like terms.

Q: What is the result of multiplying two exponential expressions with different bases?

A: The result of multiplying two exponential expressions with different bases is an exponential expression with a base that is the product of the bases of the two exponential expressions.

Q: Can I multiply a fraction by a complex number?

A: Yes, you can multiply a fraction by a complex number. To do this, multiply the numerator of the fraction by the complex number and keep the denominator the same.

Q: Can I multiply two complex numbers?

A: Yes, you can multiply two complex numbers. To do this, multiply each term of the first complex number by each term of the second complex number and then combine like terms.

Q: What is the result of multiplying two complex numbers with different exponents?

A: The result of multiplying two complex numbers with different exponents is a complex number with an exponent that is the sum of the exponents of the two complex numbers.

Q: Can I multiply a fraction by a matrix?

A: Yes, you can multiply a fraction by a matrix. To do this, multiply the numerator of the fraction by the matrix and keep the denominator the same.

Q: Can I multiply two matrices?

A: Yes, you can multiply two matrices. To do this, multiply each term of the first matrix by each term of the second matrix and then combine like terms.

Q: What is the result of multiplying two matrices with different dimensions?

A: The result of multiplying two matrices with different dimensions is a matrix with a dimension that is the product of the dimensions of the two matrices.

Q: Can I multiply a fraction by a vector?

A: Yes, you can multiply a fraction by a vector. To do this, multiply the numerator of the fraction by the vector and keep the denominator the same.

Q: Can I multiply two vectors?

A: Yes, you can multiply two vectors. To do this, multiply each term of the first vector by each term of the second vector and then combine like terms.

Q: What is the result of multiplying two vectors with different dimensions?

A: The result of multiplying two vectors with different dimensions is a vector with a dimension that is the product of the dimensions of the two vectors.

Q: Can I multiply a fraction by a tensor?

A: Yes, you can multiply a fraction by a tensor. To do this, multiply the numerator of the fraction by the tensor and keep the denominator the same.

Q: Can I multiply two tensors?

A: Yes, you can multiply two tensors. To do this, multiply each term of the first tensor by each term of the second tensor and then combine like terms.

Q: What is the result of multiplying two tensors with different dimensions?

A: The result of multiplying two tensors with different dimensions is a tensor with a dimension that is the product of the dimensions of the two tensors.

Q: Can I multiply a fraction by a differential?

A: Yes, you can multiply a fraction by