A billion is a big number! It has 1,000 millions in it. Imagine you have $1 – that’s like 1 dollar. But if you have $1,000, that’s like 1,000 dollars. So, a billion is like having 1,000 stacks of $1 million each! Each million is a thousand times smaller than a billion. It’s like having a big pizza (a billion) cut into a thousand slices (millions). When you gather 1,000 of those slices, you have a whole new gigantic pizza, and that’s a billion!