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$\dfrac { 3 } { \color{#FF6800}{ 8 } } + \dfrac { 11 } { \color{#FF6800}{ 12 } }$

$ $ The smallest common multiple in denominator is $ 24$

$\dfrac { 3 } { \color{#FF6800}{ 8 } } + \dfrac { 11 } { \color{#FF6800}{ 12 } }$

$\dfrac { 3 } { 8 } + \dfrac { 11 } { 12 }$

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

$\dfrac { 3 \times \color{#FF6800}{ 3 } } { 8 \times \color{#FF6800}{ 3 } } + \dfrac { 11 \times \color{#FF6800}{ 2 } } { 12 \times \color{#FF6800}{ 2 } }$

$\color{#FF6800}{ \dfrac { 3 \times 3 } { 8 \times 3 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 11 \times 2 } { 12 \times 2 } }$

$ $ Organize the expression $ $

$\color{#FF6800}{ \dfrac { 9 } { 24 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 22 } { 24 } }$

$\color{#FF6800}{ \dfrac { 9 } { 24 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { 22 } { 24 } }$

$ $ Since the denominator is the same as $ 24 $ , combine the fractions into one $ $

$\color{#FF6800}{ \dfrac { 9 + 22 } { 24 } }$

$\dfrac { \color{#FF6800}{ 9 } \color{#FF6800}{ + } \color{#FF6800}{ 22 } } { 24 }$

$ $ Add $ 9 $ and $ 22$

$\dfrac { \color{#FF6800}{ 31 } } { 24 }$