Adding up the $

I will tell you that this week in Destin, my sharp math skills came into play:

• Figuring 20% of the restaurant bill in order to tip the server
• Changing our watches to reflect the time in Florida (they are one hour behind us, therefore they are on Central time)
• Adding up the $ we spent for each activity ($65 to waverun for 1/2 hour;--yikes!)
• Separating the litter that Cory, Brennan, and I picked up from the beach one morning--we discussed reasons for littering, how it would affect the animals in the ocean, and prevention.
• The number of Dt. Coke cans we all accummlated during the week.
• Whether $3.96 was a good deal for milk compared the Wal-Mart price of $2.96--was it worth the drive to Wal-Mart to save the $1?

What have you done lately to keep your math skills fresh?