next number in the following number series

Hi Valerie,

If we look at the change from one number to the next, we get --

100 to 96: -4

96 to 104: +8

104 to 88: -16

88 to 120: +32

120 to 56: -64

The pattern I see is the the change from one value to the next keeps doubling, and changing sign. That is, the change from one value to the next is -2 * the previous change.

With this information, can you determine the next change after -64, and then add it to 56 to get the next value ?

Hope this helps.