Arithmetic actually is hard for us because we don't have the metric system.
Originally Posted by Cryptocode
Arithmetic is hard for us because they stopped teaching meaningful arithmetic back when it appeared that we might go metric. Why teach English if we were going metric. But we didn't go metric, and they still teach neither. Kids now have no sense of measurement, why anyone would measure anything.
Originally Posted by RichMahogany
I taught earth science in high school for a semester some years back. The kids were convinced changing kilometers to meters was "converting". Sob.