2 is twice as much as 1, and here it is 2- 1= 1.

1.5 is more than half of 1, and here is 1.5- 1=0.5.

Then why is one extra 1 double and the other extra 0.5 half?

We simplify it to a general formula:

A-B

P =-p is a multiple,

b

For example:

2 - 1

P =-= 1 time.

1

1.5 - 1

P =-= 0.5 half.

1