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Upper And Lower Sums Calculator . Embed this widget » math help boards: Enter the function, upper and lower bound in the input field. Upper and lower Riemann Sums GeoGebra from www.geogebra.org How to use the summation calculator. By · may 13, 2022 · may 13, 2022. In mathematics, a riemann sum is a type of estimation of a definite integral by a finite sum with a specified lower and upper bound, which was founded by b.riemann (1826−1866), a german.