Math illiteracy

This site continues to mention math curricula challenges from time to time, and as long as I am around, and have community math experiences, it will continue to do so.
I try to visit Madison’s wonderful Farmer’s Market weekly. This past weekend, I purchased some fabulous raspberries from an older Hmong couple. Their raspberries are the best. Unfortunately, while I made my purchase, they asked how much change I was due, something I saw repeated with other buyers. They periodically have a younger person around to handle the transactions, or a calculator.
Purchasing tickets at high school sporting events presents yet another opportunity to evaluate high schooler’s basic, but ESSENTIAL math skills. A Dane County teenager could not make change from $10 for three $2 tickets recently. I have experienced this at local retail establishments as well.
Unfortunately, the “Discovery” approach to math does not appear work….