What number comes next 100 96 104 88 120 56?

Hi there!

Let's first look at the series itself.

First number: 100
Second number: 96 (change of -4)
Third number: 104 (change of +8)
Fourth number: 88 (change of -16)
Fifth number: 120 (change of +32)
Sixt number: 56 (change of -64)

As we can see in our series, the change always doubles, and therefore the next change will be 128. During the series positive and negative changes occur alternately. Since the last change was a negative one, our next change will be positive.

We can get to the following conclusion: our following change in the series will be +128.

Let's add!
56 + 128 = 184

Hence, the answer is 184.
~ Hope this helps you!