Question

Find:
a)3/8 + 4/7
b)7/9 - 5/11
c)3 2/5 - 5 4/9

Answer 1

Step-by-step explanation:

a)3/8 + 4/7

   LCM of 7 and 8 is 56

     $\frac{(7 * 3) + (8 * 4)}{56}$ =  $\frac{21 + 32}{56}$ = $\frac{53}{56}$

b)7/9 - 5/11

  LCM of 9 and 11 and 99

    $\frac{(7 * 11) - ( 5 * 9)}{99}$ = $\frac{77 - 45}{99}$ = $\frac{32}{99}$

c)3 2/5 - 5 4/9

    $\frac{17}{5} - \frac{49}{9}$

   LCM of 5 and 9 is 45

     $\frac{(17 * 9) - (49 * 5)}{45}$ = $\frac{153 - 245}{45}$ = $\frac{-92}{45}$ = $-2\frac{2}{45}$