When looking through memory dumps it's often useful to keep an eye out for some well-known float values.
Here's a little table with the byte dumps as you might seem them on an x86 system.
-INFINITY: 00 00 80 ff
-1: 00 00 80 bf
-FLT_MIN/2: 00 00 40 80
-0: 00 00 00 80
0: 00 00 00 00
FLT_MIN/2: 00 00 40 00
1: 00 00 80 3f
INFINITY: 00 00 80 7f
NAN: 00 00 c0 ff
Happy floats!