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Find the sum of the fractions
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$\dfrac { 17 } { 20 }$
Find the sum of the fractions
$\dfrac { 1 } { \color{#FF6800}{ 4 } } + \dfrac { 3 } { \color{#FF6800}{ 5 } }$
$ $ The smallest common multiple in denominator is $ 20$
$\dfrac { 1 } { \color{#FF6800}{ 4 } } + \dfrac { 3 } { \color{#FF6800}{ 5 } }$
$\dfrac { 1 } { 4 } + \dfrac { 3 } { 5 }$
$ $ Multiply the denominator and the numerator so that the denominator is the smallest common multiple $ $
$\dfrac { 1 \times \color{#FF6800}{ 5 } } { 4 \times \color{#FF6800}{ 5 } } + \dfrac { 3 \times \color{#FF6800}{ 4 } } { 5 \times \color{#FF6800}{ 4 } }$
$\color{#FF6800}{ \dfrac { \color{#FF6800}{ 1 } \color{#FF6800}{ \times } \color{#FF6800}{ 5 } } { \color{#FF6800}{ 4 } \color{#FF6800}{ \times } \color{#FF6800}{ 5 } } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { \color{#FF6800}{ 3 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } } { \color{#FF6800}{ 5 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } } }$
$ $ Organize the expression $ $
$\color{#FF6800}{ \dfrac { \color{#FF6800}{ 5 } } { \color{#FF6800}{ 20 } } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { \color{#FF6800}{ 12 } } { \color{#FF6800}{ 20 } } }$
$\color{#FF6800}{ \dfrac { \color{#FF6800}{ 5 } } { \color{#FF6800}{ 20 } } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { \color{#FF6800}{ 12 } } { \color{#FF6800}{ 20 } } }$
$ $ Since the denominator is the same as $ 20 $ , combine the fractions into one $ $
$\color{#FF6800}{ \dfrac { \color{#FF6800}{ 5 } \color{#FF6800}{ + } \color{#FF6800}{ 12 } } { \color{#FF6800}{ 20 } } }$
$\dfrac { \color{#FF6800}{ 5 } \color{#FF6800}{ + } \color{#FF6800}{ 12 } } { 20 }$
$ $ Add $ 5 $ and $ 12$
$\dfrac { \color{#FF6800}{ 17 } } { 20 }$
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