Why do we count the initial number when we say something is X times bigger?

Question

Why do we count the initial number when we say something is X times bigger?

In: 42

Answer 1

Because it is a multiple of the current amount. If something is 100 and something else is 2x larger it will be 100*2= 200 IF you do you can have some in 0.5 the amount and then you have 100*0.5=50

You can something is 200% larger than it is an addition and you have 100 + 100* 2 = 300