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$\dfrac { 7 } { \color{#FF6800}{ 10 } } - \dfrac { 3 } { \color{#FF6800}{ 5 } }$

$ $ The smallest common multiple in denominator is $ 10$

$\dfrac { 7 } { \color{#FF6800}{ 10 } } - \dfrac { 3 } { \color{#FF6800}{ 5 } }$

$\dfrac { 7 } { 10 } - \dfrac { 3 } { 5 }$

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

$\dfrac { 7 } { 10 } - \dfrac { 3 \times \color{#FF6800}{ 2 } } { 5 \times \color{#FF6800}{ 2 } }$

$\color{#FF6800}{ \dfrac { 7 } { 10 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 3 \times 2 } { 5 \times 2 } }$

$ $ Organize the expression $ $

$\color{#FF6800}{ \dfrac { 7 } { 10 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 6 } { 10 } }$

$\color{#FF6800}{ \dfrac { 7 } { 10 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 6 } { 10 } }$

$ $ Since the denominator is the same as $ 10 $ , combine the fractions into one $ $

$\color{#FF6800}{ \dfrac { 7 - 6 } { 10 } }$

$\dfrac { \color{#FF6800}{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 6 } } { 10 }$

$ $ Subtract $ 6 $ from $ 7$

$\dfrac { \color{#FF6800}{ 1 } } { 10 }$