Formula Future

In the formula for future value (fv = pv (1+i)^t) i am drawing a blank for basic math. why do we need the 1?

Why do we need the 1? For example: if we have fv = 100,000 (1+6%)^3, we are essentially saying: “The future value of 100,000 with a 6% return after 3 years”. The question is why do we need the 1 to make it 1.06? Why not just make it 100,000 x 6%? What is the rule that requires that 1 to be in the formula. This little basic math question has me curious.

if you deposit $100 at 5%, then after one year, you do not have $5, you have $105.
We insert the 1 because we keep our principle.

Future GPX Cyber Formula SIN #1 2/3