👉 The term "summing" in mathematics refers to the process of adding or combining numbers together. It is often used when dealing with mathematical expressions or calculations, where the goal is to find a total value for some set of quantities. Summation notation is commonly used to represent this process as follows: Summation notation: ∑ (n + r) = n2 + nr Where: - ∑ represents the summation symbol. - n and r are the terms being summed.