Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>bingo.html</title>
</head>
<body>
<input type="text" id="numero">
<input type="submit" id="verificar" value="Adicione e verifique no Bingo!">

<script>
var numero = document.getElementById("numero").value;

function printNumero() {
    var numero = document.getElementById("numero").value;
    return numero;
};

var verificar = document.getElementById("verificar");
verificar.addEventListener("click", function() {
    console.log(numero);
});
</script>
</body>
</html>