diff --git a/numerical_methods/Seidal.C b/numerical_methods/gauss_seidel_method.c
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rename from numerical_methods/Seidal.C
rename to numerical_methods/gauss_seidel_method.c
diff --git a/numerical_methods/lagrange_theorem.C b/numerical_methods/lagrange_theorem.c
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rename from numerical_methods/lagrange_theorem.C
rename to numerical_methods/lagrange_theorem.c
diff --git a/numerical_methods/MEAN.C b/numerical_methods/mean.c
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rename from numerical_methods/MEAN.C
rename to numerical_methods/mean.c
diff --git a/numerical_methods/MEDIAN.C b/numerical_methods/median.c
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rename from numerical_methods/MEDIAN.C
rename to numerical_methods/median.c