Binary 12 ?

[curious1]

Heres an easy one.
What's a Microcontroller, chapter 6, one of the little ? boxes says binaryc% 00001100 = decimal no. 12.
I dont get it.
Please briefly explain.
(forgive me, I'm new)

[T Chap]

00000000 0 $0 ' binary, dec, hex all same number, different ways to write them
00000001 1 $1
00000010 2 $2
00000011 3 $3
00000100 4 $4
00000101 5 $5
00000110 6 $6
00000111 7 $7
00001000 8 $8
00001001 9 $9
00001010 10 $a
00001011 11 $b
00001100 12 $c

[curious1]

Thanks,
I tried to write that out the same way but goofed up around 5,6,or 7.
Geeesssh, duhhh.
(thanks)