Roman Conversion

function convert(){
var number = document.getElementById('num').value;
var romans = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX', 'X'];
document.getElementById('romanNum').innerHTML = romans[number - 1];
}

Kelvin Converter

function conKel() {
var fahr = document.getElementById('tempFahr').value;
var fahrNum = Number(fahr);
var kel = ((fahrNum - 32) / 1.8) + 273;
document.getElementById('tempKel').innerHTML = kel + 'K';
}

℉

Secret Number Game

function chkSecret() {
var inNum = document.getElementById('userNum').value;

if (inNum > 12) {
document.getElementById('response').innerHTML = 'Your too high. Try again.';
} else if (inNum < 12) {
document.getElementById('response').innerHTML = 'Your too low. Try again';
} else {
document.getElementById('response').innerHTML = 'Congrats! You won!';
}
}