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Formula
Find the sum or difference of the fractions
$- \dfrac{ 1 }{ 20 } - \dfrac{ 1 }{ 20 }$
$- \dfrac { 1 } { 10 }$
Find the sum or difference of the fractions
$\color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 1 } { 20 } } \color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 1 } { 20 } }$
 Since the denominator is the same as $20$ , combine the fractions into one 
$\color{#FF6800}{ \dfrac { - 1 - 1 } { 20 } }$
$\dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 1 } \color{#FF6800}{ - } \color{#FF6800}{ 1 } } { 20 }$
 Find the sum of the negative numbers 
$\dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 2 } } { 20 }$
$\dfrac { \color{#FF6800}{ - } \color{#FF6800}{ 2 } } { 20 }$
 Move the minus sign to the front of the fraction 
$\color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 2 } { 20 } }$
$\color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 2 } { 20 } }$
 Reduce the fraction to the lowest term 
$\color{#FF6800}{ - } \color{#FF6800}{ \dfrac { 1 } { 10 } }$
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