Make the sequence 0 1 1 0 1. The zero represents the card when it is face down and therefore whether the value of the card is to be counted. Therefore the binary number 01101 is equivalent to the decimal number 13.

1. By flipping the cards, show how to make just 5 faces show, try 3, 12, 19. Is there more
    than one way to get any number?

2. What are the highest and lowest numbers you can make?

3. If we added another card, how many bits would it have? What is the biggest number
    we can make then?

4. What day of the month were you born on? Make it in using the cards.

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