37 : 2 = 18 rest 1
18 : 2 = 9 rest 0
9 : 2 = 4 rest 1
4 : 2 = 2 rest 0
2 : 2 = 1 rest 0
37 = 100101 (2)
____________
45 : 2 = 22 rest 1
22 : 2 = 11 rest 0
11 : 2 = 5 rest 1
5 : 2 = 2 rest 1
2 : 2 = 1 rest 0
45 = 101101 (2)
____________
124 : 2 = 62 rest 0
62 : 2 = 31 rest 0
31 : 2 = 15 rest 1
15 : 2 = 7 rest 1
7 : 2 = 3 rest 1
3 : 2 = 1 rest 1
124 = 1111100 (2)
_____________
9 : 2 = 4 rest 1
4 : 2 = 2 rest 0
2 : 2 = 1 rest 0
9 = 1001 (2)
_________