Question

Question #804b8

Answer 1

Let, the blank number be `x`
Then,
`8/10+x=1`
Note- 1 can also be written as `1/1,2/2,3/3,.....,10/10`
Using that
`8/10+x=10/10`
Subtract `8/10` from both sides
`cancel(8/10)cancel(+8/10)+x=10/10-8/10`
`x=(10-8)/10`
Solve
`x=2/10`
Simplify
`x=(cancel2^1)/(cancel(10^5)`
`x=1/5`