how many billion in a trillion

We believe that the answer is one thousand times one billion equals one trillion. In the American system one billion is 1,000,000,000 and a trillion is 1,000,000,000,000 so one trillion is one thousand times one billion.

So, We believe that the answer is  $$One\;Thousand\;times\;One\;Billion.$$   $$1,000*1,000,000,000$$