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$\dfrac { 7 } { \color{#FF6800}{ 8 } } - \dfrac { 1 } { \color{#FF6800}{ 5 } }$

$ $ The smallest common multiple in denominator is $ 40$

$\dfrac { 7 } { \color{#FF6800}{ 8 } } - \dfrac { 1 } { \color{#FF6800}{ 5 } }$

$\dfrac { 7 } { 8 } - \dfrac { 1 } { 5 }$

$ $ Multiply the denominator and the numerator so that the denominator is the smallest common multiple $ $

$\dfrac { 7 \times \color{#FF6800}{ 5 } } { 8 \times \color{#FF6800}{ 5 } } - \dfrac { 1 \times \color{#FF6800}{ 8 } } { 5 \times \color{#FF6800}{ 8 } }$

$\color{#FF6800}{ \dfrac { 7 \times 5 } { 8 \times 5 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 1 \times 8 } { 5 \times 8 } }$

$ $ Organize the expression $ $

$\color{#FF6800}{ \dfrac { 35 } { 40 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 8 } { 40 } }$

$\color{#FF6800}{ \dfrac { 35 } { 40 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 8 } { 40 } }$

$ $ Since the denominator is the same as $ 40 $ , combine the fractions into one $ $

$\color{#FF6800}{ \dfrac { 35 - 8 } { 40 } }$

$\dfrac { \color{#FF6800}{ 35 } \color{#FF6800}{ - } \color{#FF6800}{ 8 } } { 40 }$

$ $ Subtract $ 8 $ from $ 35$

$\dfrac { \color{#FF6800}{ 27 } } { 40 }$