I am confusing about some data for calculus.
First, the equivalence of weight: 1kgf=9.8N
Second, the mass of 1 Newton is: 1N/(9.8m/s$^2$).
And finally, to get the mass of 1kgf, I have to divide by the gravity.
An example of a weight of P=10N:
P=10N$\cfrac{\text{1kgf}}{9.8N}\approx1$kgf; its mass: $m=\cfrac{P}{g}=\cfrac{1kgf}{9.8m/s^2}\approx0.1kg$
While, directly from Newtons: $m=\cfrac{10N}{9.8m/s^2}\approx1kg$
What I am doing wrong?