need someone that knows how to write 0-15 in binary

I need someone to tell me how to write the numbers 0-15 in binary. My programming class is first period and I only got 4 hours of sleep so I was too tired to pay attention, each number has to be written in a set of 4 bits.

Nigga
binary is a base-2 system

0: 0000
1: 0001
2: 0010
3: 0011
4: 0100
5: 0101
6: 0110
7: 0111
8: 1000
9: 1001
10: 1010
11: 1011
12: 1100
13: 1101
14: 1110
15: 1111