The grandparents are in steady conflict with their grandchildren, because the grandchildren mesure in cm, meters and kilometers while the grandparents are still with their inches, feet and miles ! That's the same with the temperatures.
As 1 inch is 2.54 cm, it is far better to use inches when you measure your waist, it makes you slim !
If your waist measures 60 cm, the number sounds a lot, but if it measures only 24 inches, it is a small number ! That sounds much better and would look better on a paper when you want to be a model. The numbers are not so high and that counts for everything. That's maybe because the Americans keep with their inches, because if they had a waist of 60 that would be 153 cm !
Anyway I have learned at school that inches exist, for the rest I must have slept, because I didn't like Math classes. When I stayed with my aunt in Madison Wisconsin, we never talked about the system of measurements, and I didn't care about how many km or miles we made per day when we travelled or how many inches her cat's tail measured.
