fixed math error :-/

nucleo-f412zg/pi/README.md

@@ -9,4 +9,4 @@ After re-consulting the data sheet, I changed the calculation variables from `do
 
 ![pi capture2](pi_capture2.png)
 
-Using the above calculations, this suggests the STM32F412 is running at 1.95 MFLOPS, or 33 clock cycles per iteration. Adding the `-ffast-math` option to `rules.mk` did not change this number.
+Using the above calculations, this suggests the STM32F412 is running at 12.79 MFLOPS, or 33 clock cycles per iteration. Adding the `-ffast-math` option to `rules.mk` did not change this number.
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