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The derivation of the tensor transformation properties for mixed tensors establishes the rule that a mixed tensor of type (n, m), having n contravariant indices and m covariant indices, transforms according to the independent action of each index type. The core principle is that a scalar formed by contracting the mixed tensor with appropriate covariant and contravariant vectors must be invariant under coordinate changes. This leads to the transformation rule: each contravariant index transforms with a factor of the Jacobian, and each covariant index transforms with a factor of the inverse Jacobian. The overall transformation is the product of n Jacobian factors and m inverse Jacobian factors.