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