diff --git a/moduledemo/calc/calcdemo.go b/moduledemo/calc/calcdemo.go
new file mode 100644
index 0000000..a20ca39
--- /dev/null
+++ b/moduledemo/calc/calcdemo.go
@@ -0,0 +1,17 @@
+package calc
+
+func Add(a, b float64) float64 {
+	return a + b
+}
+
+func Sub(a, b float64) float64 {
+	return a - b
+}
+
+func Mult(a, b float64) float64 {
+	return a * b
+}
+
+func Divi(a, b float64) float64 {
+	return a / b
+}
diff --git a/moduledemo/go.mod b/moduledemo/go.mod
new file mode 100644
index 0000000..e6b2088
--- /dev/null
+++ b/moduledemo/go.mod
@@ -0,0 +1,3 @@
+module moduledemo
+
+go 1.17
diff --git a/moduledemo/main.go b/moduledemo/main.go
new file mode 100644
index 0000000..9f37a5b
--- /dev/null
+++ b/moduledemo/main.go
@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"moduledemo/calc"
+)
+
+func main() {
+	var a, b float64
+	a, b = 6, 3
+	fmt.Println(calc.Add(a, b))
+	fmt.Println(calc.Sub(a, b))
+	fmt.Println(calc.Mult(a, b))
+	fmt.Println(calc.Divi(a, b))
+}