next number in the following number series
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.