All of these activities involve a calculator. In two of these activities (#2 and #3), you are asked to do calculations and then
turn the calculator upside down to read
a message or word. Most of the scientific calculators do not give a good read out. The number 4 when turned upside down
is supposed to give you a lower case h, but it is difficult to read on a scientific calculator
(likewise, the 8 when turned upside down is supposed to be an upper case B).