Let's think of conversions that US students need to learn

What do students in the USA need to learn?

km
liters
ml
degrees C



Do you have some tricks to share?  



3.72 liters = 1 gallon

Notice the pattern:  the "tens" go up (as the temperature increases) and the "ones" go down.  For example, when the temperature goes fro 20 C to 25 C, the temp in F goes from 68 F to 77 F.

95 F      35
86         30
77         25
68         20
59         15
50 F      10 C
41           5
32           0



16 km = 10 miles, so that ratio works well.
  8             5  

160 km     100 miles
  80             50
  40             25


And how about A4 paper?