Table of Contents

Last modified on July 18th, 2024

Simplifying a fraction means reducing a fraction to its lowest form. A fraction is said to be in its simplest form if 1 is the only common factor of its numerator and denominator. For example,

${\dfrac{3}{5}}$ is in its simplest or lowest form since 1 is the only common factor of 3 and 5.

In this method, we first find the common factors of the numerator and denominator. Then, we divide both parts by their common factors until they have no common factor except 1.

Let us simplify ${\dfrac{8}{28}}$

**Finding the Factors of the Numerator and Denominator **

The factors of 8 are 1, 2, 4, 8

The factors of 28 are 1, 2, 4, 7, 14, 28

**Determining the Common Factors of the Numerator and Denominator **

The common factors of 8 and 28 are 1, 2, and 4

**Dividing the numerator and denominator by the common factors **

On dividing the numerator and denominator by 2, we get

${\dfrac{8\div 2}{28\div 2}=\dfrac{4}{14}}$

Again, by dividing the numerator and denominator by 2, we get

${\dfrac{4\div 2}{14\div 2}=\dfrac{2}{7}}$, which is in its simplest form.

Thus, ${\dfrac{8}{28}}$is simplified to ${\dfrac{2}{7}}$

To simplify proper fractions, we first find the GCF (greatest common factor) of the numerator and denominator and then divide both by their GCF.

Let us simplify the fraction ${\dfrac{18}{30}}$

**Finding the GCF of the Numerator and Denominator **

The factors of 18 are 1, 2, 3, 6, 9, 18

The factors of 30 are 1, 2, 3, 5, 6, 10, 15, 30

The GCF of 18 and 30 is 6

**Dividing Both Numerator and Denominator by GCF**

On dividing the numerator and denominator by 6, we get

${\dfrac{18\div 6}{30\div 6}=\dfrac{3}{5}}$

Here, 1 is the only common factor of 3 and 5

Thus, ${\dfrac{3}{5}}$ is in its simplest form.

In this method, we find prime factors of the numerator and denominator and cancel out the common factors from both parts.

Let us simplify the fraction ${\dfrac{42}{54}}$

**Prime Factorizing the Numerator and Denominator **

${\dfrac{42}{54}}$ = ${\dfrac{2\times 3\times 7}{2\times 3\times 3\times 3}}$

**Cancelling the Common Factors **

= ${\dfrac{7}{3\times 3}}$

= ${\dfrac{7}{9}}$, which is in its simplest form.

Thus, ${\dfrac{42}{54}}$ = ${\dfrac{7}{9}}$

To simplify improper fractions, we divide the numerator and denominator by their GCF and then convert them to mixed numbers.

Let us simplify a fraction ${\dfrac{36}{24}}$

**Finding the GCF of the Numerator and Denominator **

The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36

The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24

The GCF of 36 and 24 is 12

**Dividing Both Numerator and Denominator by GCF**

On dividing the numerator and denominator by 12, we get

${\dfrac{36\div 12}{24\div 12}=\dfrac{3}{2}}$

Here, 1 is the only common factor of 3 and 2

**Converting to Mixed Number**

${\dfrac{3}{2}}$ = ${1\dfrac{1}{2}}$

Thus, ${1\dfrac{1}{2}}$ is in its simplest form.

To simplify the mixed numbers, we first divide the numerator and denominator of the fractional parts by finding their GCF and then write the whole and the simplified fraction together.

Let us simplify ${1\dfrac{8}{12}}$

**Finding the GCF of the Numerator and Denominator **

The factors of 8 are 1, 2, 4, 8

The factors of 12 are 1, 2, 3, 4, 6, 12

The HCF of 8 and 12 is 4

**Dividing Both Numerator and Denominator by GCF**

On dividing the numerator and denominator by 4, we get

${\dfrac{8\div 4}{12\div 8}=\dfrac{2}{3}}$

Here, 1 is the only common factor of 2 and 3

**Writing the Whole and the Simplified Fraction**

Thus, the simplified number is ${1\dfrac{2}{3}}$

We can also simplify fractions containing variables. To do so, we use the expanded form of each term in the numerator and denominator and then divide both parts by the common variables.

Let us simplify the fraction ${\dfrac{x^{4}y}{x^{2}y^{3}}}$

**Expanding Both Numerators and Denominators **

${\dfrac{x^{4}y}{x^{2}y^{3}}}$ = ${\dfrac{x\times x\times x\times x\times y}{x\times x\times y\times y\times y}}$

**Cancelling the Common Variables **

${\dfrac{x\times x\times x\times x\times y}{x\times x\times y\times y\times y}}$ = ${\dfrac{x\times x}{y\times y}}$ = ${\dfrac{x^{2}}{y^{2}}}$

Thus, ${\dfrac{x^{2}}{y^{2}}}$ is the simplified fraction.

To simplify the fraction containing exponents, we use the expanded form of exponents and then cancel the common factors.

Let us simplify the fraction ${\dfrac{2^{4}}{2^{2}}}$

**Expanding Both Numerators and Denominators **

${\dfrac{2^{4}}{2^{2}}}$ = ${\dfrac{2\times 2\times 2\times 2}{2\times 2}}$

**Cancelling the Common Factors **

${\dfrac{2\times 2\times 2\times 2}{2\times 2}}$ = ${2\times 2}$ = ${4}$ = ${\dfrac{4}{1}}$

Thus, ${4}$ or ${\dfrac{4}{1}}$ is in its simplest form.

**Find the simplest form of the fraction ${\dfrac{60}{360}}$**

Solution:

The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

The factors of 360 are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, 360

The GCF of 60 and 360 is 60

On dividing the numerator and denominator of the given fraction ${\dfrac{60}{360}}$ by 60, we get

${\dfrac{60\div 60}{360\div 60}=\dfrac{1}{6}}$

Thus, the simplified fraction is ${\dfrac{1}{6}}$

**Find the simplest form of the fraction ${\dfrac{12}{28}}$**

Solution:

The factors of 12 are 1, 2, 3, 4, 6, 12

The factors of 28 are 1, 2, 4, 7, 14, 28

The GCF of 12 and 28 is 4

On dividing the numerator and denominator of the given fraction ${\dfrac{12}{28}}$ by 4, we get

${\dfrac{12\div 4}{28\div 4}=\dfrac{3}{7}}$

Thus, the simplified fraction is ${\dfrac{3}{7}}$

Last modified on July 18th, 2024