Operation math nodes

Absolute
Outputs the absolute value of the input.
Average
Output the average of the list of inputs.
InverseLerp
Outputs the weight from the interpolation between the 2 input values.
w = -i1 / (i2 - i1)
Lerp
Outputs the weight used to compute the given interpolation from the 2 inputs.
o = w * i1 + (1-w) * i2.
Log
Outputs the logarithm of the input in the given base.
The logarithm is the inverse function to the exponentiation. It computes the exponent to which the base must be raised in order to produce x.
Modulo
Outputs the modulo of the input using the given modulus.
The modulo is the wrapped around value of the input using modular arithmetic.
Multiply
Outputs the product of its inputs.
Negate
Outputs the negated value to its input. For example, if the input is 5, the output will be -5.
Power
Output the input raised to the power of the exponent.
Sum
Outputs the sum of the list of inputs.