I can't Count

Today was swimming. The team shows up to the pool and the CL tells to start warming up with an 800 yd easy swim.  Nothing like a15 min swim to warmup with.  Is there?

Then she tells us to do the following:
100 mod
800 projected race pace

100 mod

800 projected race pace

100 mod

800 projected race pace

100 hard

200 cool down back

So I get to the race pace and ask the CL what I should do. She says 15mn per 800.  Then my brain goes on hold and any cognitive thought resembling mathematics leaves my brain. Because I then determine that 2mn per100 for 800 is 18 mn. Not really, but thats what I was thinking.  Because I want to swim a 1:45 per 100 I then subtracted 2 min to get 16mn, but The CL told me 15mn? Well I decide to do the 15 min and swim each 800 hard.  However I was tracking my laps by time thus because of my math error and counting lap, I was doing 1:40 per 100. Well this equates to 900 yes not 800.  Instead of swimming 3800 today I swam 4100.  

Oh joy!  I will have to come up with a better way to count laps.  

Train Smart, Train Hard,

XXX