1 EASY A billion has how many zeros? 3691215

 2 EASY A trillion has how many zeros? 3691215

 3 EASY $$1000000000000$$ is TrillionBillionMillionGoogolGoogle

 4 EASY Which is biggest? MillionBillionTrillionGazillionBajillion

 5 EASY Which is smallest? BajillionthTrillionthMillionBillionTrillion

 6 MEDIUM $$1042453-26343$$

 7 HARD $$264440003+263444009$$