Muhammad, Imran2017-11-142017-11-142017-11-14wahyu sari yenihttp://repository.unri.ac.id:8080/xmlui/handle/123456789/9062We discussed some derivations of Simpson rule formulas that are not commonly discussed in numerical analysis texts. The derivation involved a Lagrange interpolating polynomial, and a quadratic polynomial analytically and a combination of trapezoidal rule and midpoint rule, and a combination trapezoidal rule analytically and numerically. All the derivations ended up with the same formula of Simpson rule.enSimpson ruleLagrange polynomialmidpoint ruletrapezoidal ruleArticle