Select the number/word combination that best estimates each number.

1. 87,300,000
   
   • 87.3 billion
   • 8.7 million
   • 87.3 million
   
   
2. 2,670,000,000,000
   
   • 2.7 billion
   • 2.7 trillion
   • 2700 million
   
   
3. 234,700,000,000
   
   • 235 trillion
   • 235 million
   • 235 billion