I was wondering how you guys in the US teach altimetry, teaching students to work out preasure height and density height.

Here in Oz, we use metric (deg C and pressure in hectopascles). If the QNH is 1003Hp, we take the difference between that and the standard ISA QNH of 1013 Hp =10 hp, multiply that by 30 ft per Hp that gives us the PH. 10 x 30 = 300. Therefore PH for that day at msl is + 300 ft.if the temp was 25 deg c, its''s ISA + 10 (ISA being 15 deg C at msl) 120 ft per degree from ISA =1200 + 300 PH =1500 density height.

How do you guys work this out using inches of mercury and deg F.