The document contains 4 math problems: 1) Simplify 4 to its simplest form, which is 4. 2) Find the missing numbers in the equation _ = 2 = _4_2, which are 1 and 3. 3) Solve the equation 5 - 2 = _, which is 3. 4) Convert the decimal 0.39 to the fraction 39/100.