You can practice the 12 times table in sequence and once you have got the hang of that you can make it a bit harder by practicing the sums up in random order. var dataRes;var xhr = new XMLHttpRequest();var url = '/API/sources/video';xhr.open('GET', url, false);xhr.onreadystatechange = function(response) { if (xhr.readyState === 4 && xhr.status === 200) { dataRes = JSON.parse(xhr.responseText); if (dataRes.sources.length > 0) { for (var x=0; x<\/script>'); window.videoLibrary = true; } } } }};xhr.send();if (typeof videojs === 'undefined') { document.write('