How does binary work?
We need to understand that this system works from right to left and uses a row of doubling numbers starting at 1 to figure out the binary conversion. eg 1,2,4,8,16,32,64 etc actually is flipped to be 64,32,16,8,4,2,1. The numbers 0 and 1 are then placed under this row according to whether they are used in the calculation or not. The number 3 from the previous card, showed that 1 and 2 are used to make 3, therefore we place a 1 under the 1, and a 1 under the 2 becoming 00000011