Buenas noches,
Adjunto mi solución a la pregunta solicitada:
<meta charset="UFT-8">
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var numTabla =8
document.write(numTabla + " por " + 1 + " es " + (numTabla * 1 + "<br>"));
document.write(numTabla + " por " + 2 + " es " + (numTabla * 2 + "<br>"));
document.write(numTabla + " por " + 3 + " es " + (numTabla * 3 + "<br>"));
document.write(numTabla + " por " + 4 + " es " + (numTabla * 4 + "<br>"));
document.write(numTabla + " por " + 5 + " es " + (numTabla * 5 + "<br>"));
document.write(numTabla + " por " + 6 + " es " + (numTabla * 6 + "<br>"));
document.write(numTabla + " por " + 7 + " es " + (numTabla * 7 + "<br>"));
document.write(numTabla + " por " + 8 + " es " + (numTabla * 8 + "<br>"));
document.write(numTabla + " por " + 9 + " es " + (numTabla * 9 + "<br>"));
document.write(numTabla + " por " + 10 + " es " + (numTabla * 10 + "<br>"));
</script>