addition

var div_addition = document.getElementById('addition');
var tableau = document.createElement('table');

function newTd(content_array)
{
    var td = document.createElement('td');
    for (var i=0; i < content_array.length; i++)
        {
            var p = document.createElement('p');
            var text = document.createTextNode(content_array[i]);
            p.appendChild(text);
            td.appendChild(p);
        }
    return td;
}


function newTr(td_array)
{
    var tr = document.createElement('tr');
    for (var i=0; i < td_array.length; i++)
        {
            tr.appendChild(td_array[i]);
        }
    return tr;
}


var tr_array = new Array();
for (var i=1; i < 10; i++)
{
    console.log('reset ligne');
    var ligne = new Array();
    for (var j=1; j < 10; j++)
    {
        var resultat = i+j;
        ligne.push(i +' + '+ j +' = '+ resultat);
    }
    tr_array.push(newTd(ligne));
    if(0 == i%3)
    {
        tableau.appendChild(newTr(tr_array));
        var tr_array = new Array();
    }

    }
div_addition.appendChild(tableau);