(12)/(24)-(9)/(21) - subtraction of fractions

Solution for the given fractions

• 12/24 - 9/21 = ?
• The common denominator of the two fractions is: 168
• 12/24 = (7*12)/(7*24) = 84/168
• 9/21 = (8*9)/(8*21) = 72/168
• Fractions adjusted to a common denominator
• 12/24 - 9/21 = 84/168 - 72/168
• 84/168 - 72/168 = (84-72)/168
• (84-72)/168 = 12/168
• 12/168 = 1/14

Solution for the given fractions

$ \frac{12}{24 }-\frac{ 9}{21 }=? $

The common denominator of the two fractions is: 168

$ \frac{12}{24 }= \frac{(7*12)}{(7*24)} =\frac{ 84}{168} $

$ \frac{9}{21 }= \frac{(8*9)}{(8*21)} =\frac{ 72}{168} $

Fractions adjusted to a common denominator

$ \frac{12}{24 }-\frac{ 9}{21 }=\frac{ 84}{168 }-\frac{ 72}{168} $

$ \frac{84}{168 }-\frac{ 72}{168 }= \frac{(84-72)}{168} $

$ \frac{(84-72)}{168 }=\frac{ 12}{168} $

$ \frac{12}{168 }=\frac{ 1}{14} $

$ $

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