Crosswind Landings... But airspeed?

Chris Reed wrote:

1. ... 10 kt more for landing uphill, even more for a steep slope.
....
2. Plus half estimated max wind speed
....
3. If the wind is cross, there's a useful rule of thumb to reduce it by
1/6 for every 10 degrees from 90 to get the headwind component.

And when exactly are you going to calculate all this? :-P

I'm just doing normal approach speed plus 1/2 estimated wind, no matter
what direction (except tailwind, of course). Has always worked good
enough for me.

BTW: 5 kt for upslope is enough, even for steep slopes. But when the
field is long enough, 10 kn don't hurt, either.

Stefan