Question

What rational number should be subtracted from `5/8` to get `8/5`.

Answer 1

The required number = `5/8 - 8/5`

2	8, 5
2	4, 5
2	2, 5
5	1, 5
	1, 1

 

 

 

 

 

 

`= (5 xx 5)/(8 xx 5) - (8 xx 8)/(5 xx 8)`

(∵ L.C.M. of 8, 5 = 40)

`= (25 - 64)/40 = -39/40`