Is 100 million dollars 1 billion dollars?

No. Not at all. You need to look at place value. 1,000,000,000 is one billion while 1,000,000 is one million. 100 million is only 100,000,000. You need 10 of these (10 x 100,000,000) to get 1 billion. It's just like 100 and 1,000. You need 10 $100 bills to make $1000. You need 10 $1000's to make $10,000. You need 10 $10,000's to make $100,000. You need 10 $100,000's to make $1,000,000. You need 10 $1,000,000's to make $10,000,000. And you need 10 $10,000,000's to make $100,000,000. Finally, you need 10 $100,000,000's to make $1,000,000,000!!!

Remember to look at place value. Each place is a multiple of 10.