Question

Do as directed

a) -3/8 + 5/7
b) 13/25 -4/5

pls answer fast ...
Will mark as brainliest for the best answer .

Answer 1

a) -3/8+5/7
cross multiplying we get,
= -3×7+5×8/8×7
= -21+40/56
=19/56
=0.33
b)13/25-4/5
simplifying into same denominator
multiplying both numerator and dinominator with 5 we get,
=13/25-4×5/5×5
=13/25-20/25
=13-20/25
= -7/25
= -0.28
Hope you got it. :)

Answer 2

Hello ,

The answers you require are given below
MARK IT AS THE BRAINLIEST

Solution A
$= \frac{ - 3}{8} + \frac{5}{7} \\ = \frac{ ( - 3 \times 7) + (5 \times 8)}{8 \times 7} \\ = \frac{ - 21 + 40}{56} \\ = \frac{19}{56}$
L.C.M. of 8 and 7 is 56
So, we will make their denominators same by multiplying the number which is required to get the L.C.M. . We will multiply the same number to the numerator also.

Solution B

$= \frac{13}{25} - \frac{4}{5} \\ = \frac{13 - (4 \times 5)}{25} \\ = \frac{13 - 20}{25} \\ = - \frac{7}{25}$
L.C.M. of 5 and 25 is 25
So, we will make their denominators same by multiplying the number which is required to get the L.C.M. . We will multiply the same number to the numerator also.