1)Thirteen point twenty-four minus eleven is equal to two point twenty-fourElev thousand plus two thousand three hundred and fifty-six is equal to thirteen thousand three hundred fifty-sixFifteen point three multiply seven is equal to one hundred and seve point one.Nineteen point eighteen divided by nine is equal to two point thirteenFive and a half plus six is equal to eleven and a halfThree fourth plus two third is equal to one and five twelfth2)Two thousand and fiveEighteen seventy sixTwenty nineth of December nineteen ninety eightIvan's birthday is on the thirteenth of August