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Find the difference
$\dfrac{ 7 }{ 8 } - \dfrac{ 1 }{ 2 }$
$\dfrac { 3 } { 8 }$
Find the difference
$\dfrac { 7 } { \color{#FF6800}{ 8 } } - \dfrac { 1 } { \color{#FF6800}{ 2 } }$
 The smallest common multiple in denominator is $8$
$\dfrac { 7 } { \color{#FF6800}{ 8 } } - \dfrac { 1 } { \color{#FF6800}{ 2 } }$
$\dfrac { 7 } { 8 } - \dfrac { 1 } { 2 }$
 Multiply the denominator and the numerator so that the denominator is the smallest common multiple 
$\dfrac { 7 } { 8 } - \dfrac { 1 \times \color{#FF6800}{ 4 } } { 2 \times \color{#FF6800}{ 4 } }$
$\color{#FF6800}{ \dfrac { 7 } { 8 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 1 \times 4 } { 2 \times 4 } }$
 Organize the expression 
$\color{#FF6800}{ \dfrac { 7 } { 8 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 4 } { 8 } }$
$\color{#FF6800}{ \dfrac { 7 } { 8 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 4 } { 8 } }$
 Since the denominator is the same as $8$ , combine the fractions into one 
$\color{#FF6800}{ \dfrac { 7 - 4 } { 8 } }$
$\dfrac { \color{#FF6800}{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 4 } } { 8 }$
 Subtract $4$ from $7$
$\dfrac { \color{#FF6800}{ 3 } } { 8 }$
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