HTML
<html>
<script>
function Tabuada()
{
var res, valor = document.getElementById('tab').value;
document.getElementById('resposta').innerHTML = "";
for(var i = 2; i <= 20; i++)
{
res = i * valor;
document.getElementById('resposta').innerHTML += i + "x" + valor + " = " + res + "<br>";
}
}
</script>
<body>
<h2>Tabuada</h2>
Número: <select name="tab" id="tab">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
<button onclick="return Tabuada()" name="Tabuada">Calcular</button>
<div id="resposta"></div>
</body>
</html>
