Explanation:
10 to the power of 15 so that is 15 tens and multiple it.once you get the answer for that you would then do 4 tens multiplied by each other. and than divide 1 quadrillion ÷ by 10000 so that would be 100 billion. then you get to the 10 to the power of eleven which would be 100 billion.
also you could do is 15 - 4 and do the math that way.