What is the plot of the devils arithmetic?

What is the abbreviation stand for approx? How many syllables does 'hidden' have? What is 6.8g? What is 2.4 times 30? What is a spinner used for? Is there a word that means twice a month? What number multiplied by 50 equals 100? 420 Of what number is 26565? Who is number 97 in NASCAR? Is 30 a odd number? What has 2 triangles the rest are another shape? What is a 3 sided metal instrument? What is 1400 minus 1140? Does it is true every person have seven identical faces throughout the world? What is the height of a right triangle that has a base of 12 and a hypotenuse of 30? What causes deviation between theoretical and actual discharge in a venturi? 1 third of 30? What is the Cylinder numbering 2000 Ford Taurus 6 cylinder? Name the lengths of the sides of three rectangles that have perimeters of 14 units. Use only whole numbers? How do you know that various mathematical statements are true?