How do you simplify 4 over 20?

What is the largest prime number less than 20? How do you write 0.090 as a fraction? How do you move the screen along with the object in Game maker? Is 4 grand 4000? Can an even number be a prime number? What does each letter in stop mean? What decimal is greater than 1.1but less than 1.2? How do you use mobymax? What point on the number line best represents 1.35? What are the factors and prime factors of 853? What is the percentage between 125 and 155? Number system commonly used to represent the state of being on or off? How many square feet does a box of drywall compound cover? What number will you use to estimate 2760? How many times can 3 go to 147? What is -2.33333333 as a fraction? 410 rounded to the nearest 100? What is 516 rounded to the nearest hundred? Which one is bigger 0.25 or 0.75? What does 678k mean?