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$\dfrac { 39 } { 50 } \color{#FF6800}{ \times } \color{#FF6800}{ 100 }$

$ $ Natural numbers can be expressed as fractions with a denominator of 1 $ $

$\dfrac { 39 } { 50 } \color{#FF6800}{ \times } \color{#FF6800}{ \dfrac { 100 } { 1 } }$

$\dfrac { 39 } { \color{#FF6800}{ 50 } } \times \dfrac { \color{#FF6800}{ 100 } } { 1 }$

$ $ Reduce all denominators and numerators that can be reduced $ $

$\dfrac { 39 } { \color{#FF6800}{ 1 } } \times \dfrac { \color{#FF6800}{ 2 } } { 1 }$

$\color{#FF6800}{ \dfrac { 39 } { 1 } } \color{#FF6800}{ \times } \color{#FF6800}{ \dfrac { 2 } { 1 } }$

$ $ numerator multiply between numerator, and denominators multiply between denominators $ $

$\color{#FF6800}{ \dfrac { 39 \times 2 } { 1 \times 1 } }$

$\dfrac { \color{#FF6800}{ 39 } \color{#FF6800}{ \times } \color{#FF6800}{ 2 } } { 1 \times 1 }$

$ $ Multiply $ 39 $ and $ 2$

$\dfrac { \color{#FF6800}{ 78 } } { 1 \times 1 }$

$\dfrac { 78 } { \color{#FF6800}{ 1 } \times 1 }$

$ $ Multiplying any number by 1 does not change the value $ $

$\dfrac { 78 } { \color{#FF6800}{ 1 } }$

$\dfrac { 78 } { \color{#FF6800}{ 1 } }$

$ $ If the denominator is 1, the denominator can be removed $ $

$\color{#FF6800}{ 78 }$