Question

what number added to 0.584 gives 1?

Answer 1

Just subtract 0.584 from 1,
1-0.584 = 0.416
So, 0.416 will be added to 0.584 to give 1.

Answer 2

let the no. added be x
=) x + 0.584 =1

=) x = 1 - 0.584

=) x = 0.416 ans