Who are the main characters in the Devils Arithmetic?

How do you write the value of a decimal? Can you reduce 42 over 57? Given the standard equation for a parabola opening up or down which way does a parabola open when the coefficient of the x2term a is negative Up or down? How many different ways can you add three numbers together to add up to 17? Does 15 go into 100? Who stated out selling a relatives creams and makeup and then went on to found what became a billion dollar company? How do you find the percentage when the rate and base is given? What is 1000 binary? What is the name of a angle with its vertex at the center of the circle? Can you multiply anything to get to 91? How many cubic inches are in three cubic feet? How far apart are the cones when parallel parking? How do you calculate total phenolics by folin ciocalteu method? What are The Square Numbers Between 40 And 110? What is the base of a triangle with an area of 14 in squared and height of 4 in? Is nature a boon or a curse to man? 30 percent off of 60 equals? Which could be the measures of the angles of an obtuse triangle? What is the third angle on a triangle if you have 60 degrees and 60 degrees? What is A set that contains no elements or the number of elements in the set is a natural number is called?