Basic idea: every two into one

Let's say 1+1=10; 1+10=11; 10+10=100; 1+11=100; 10 + 11 = 101;

Let's say 1(base 2) =1 (base 10)

10(base 2)=2(base 10)

11(base 2)=3(base 10)

100(base 2)=4(base 10)