() + ()
The () + () block is a reporter block that reports the sum of the entered-in numbers. It originates from Scratch. Using block switching (which can be enabled from the addons tab), this block can be swapped into () - (), () * (), () / (), and () mod () (a feature from TurboWarp that was originally in Scratch 1.x and 2.0). The default values for this block are blank.
Workaround
This block can be worked around by using the () - () block with the first number in the first input and the second value multiplied by -1 as the second input.
(() - (() * (-1))) (() - ((0) - ()))