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Formula
Calculate the value
$\dfrac{ 4 }{ 80 } \times 100$
$5$
Calculate the value
$\color{#FF6800}{ \dfrac { 4 } { 80 } } \times 100$
 Reduce the fraction to the lowest term 
$\color{#FF6800}{ \dfrac { 1 } { 20 } } \times 100$
$\dfrac { 1 } { 20 } \color{#FF6800}{ \times } \color{#FF6800}{ 100 }$
 Natural numbers can be expressed as fractions with a denominator of 1 
$\dfrac { 1 } { 20 } \color{#FF6800}{ \times } \color{#FF6800}{ \dfrac { 100 } { 1 } }$
$\dfrac { 1 } { \color{#FF6800}{ 20 } } \times \dfrac { \color{#FF6800}{ 100 } } { 1 }$
 Reduce all denominators and numerators that can be reduced 
$\dfrac { 1 } { \color{#FF6800}{ 1 } } \times \dfrac { \color{#FF6800}{ 5 } } { 1 }$
$\color{#FF6800}{ \dfrac { 1 } { 1 } } \color{#FF6800}{ \times } \color{#FF6800}{ \dfrac { 5 } { 1 } }$
 numerator multiply between numerator, and denominators multiply between denominators 
$\color{#FF6800}{ \dfrac { 1 \times 5 } { 1 \times 1 } }$
$\dfrac { \color{#FF6800}{ 1 } \times 5 } { 1 \times 1 }$
 Multiplying any number by 1 does not change the value 
$\dfrac { \color{#FF6800}{ 5 } } { 1 \times 1 }$
$\dfrac { 5 } { \color{#FF6800}{ 1 } \times 1 }$
 Multiplying any number by 1 does not change the value 
$\dfrac { 5 } { \color{#FF6800}{ 1 } }$
$\dfrac { 5 } { \color{#FF6800}{ 1 } }$
 If the denominator is 1, the denominator can be removed 
$\color{#FF6800}{ 5 }$
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