diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjComplexSupport.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjComplexSupport.kt
index dde3bb6..06bb393 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjComplexSupport.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjComplexSupport.kt
@@ -87,11 +87,37 @@ object ObjComplexSupport {
         )
     }
 
+    internal suspend fun decimalBinary(scope: ScopeFacade, decimal: Obj, other: Obj, operator: InteropOperator): Obj? {
+        val left = ObjDecimalSupport.toDoubleOrNull(decimal) ?: return null
+        val complex = other as? ObjInstance ?: return null
+        if (complex.objClass.className != "Complex") return null
+        val otherReal = complex.readField(scope.requireScope(), "real").value.toDouble()
+        val otherImag = complex.readField(scope.requireScope(), "imag").value.toDouble()
+        return when (operator) {
+            InteropOperator.Plus -> instantiateComplex(scope, complex.objClass, left + otherReal, otherImag)
+            InteropOperator.Minus -> instantiateComplex(scope, complex.objClass, left - otherReal, -otherImag)
+            InteropOperator.Mul -> instantiateComplex(scope, complex.objClass, left * otherReal, left * otherImag)
+            InteropOperator.Div -> {
+                val denominator = otherReal * otherReal + otherImag * otherImag
+                instantiateComplex(scope, complex.objClass, left * otherReal / denominator, -left * otherImag / denominator)
+            }
+            else -> null
+        }
+    }
+
     private suspend fun ScopeFacade.newComplex(complexClass: ObjClass, real: Double, imag: Double): ObjInstance =
-        call(
-            complexClass,
-            Arguments(ObjReal.of(real), ObjReal.of(imag))
-        ) as? ObjInstance ?: raiseIllegalState("Complex() did not return an object instance")
+        instantiateComplex(this, complexClass, real, imag)
+
+    private suspend fun instantiateComplex(scope: ScopeFacade, complexClass: ObjClass, real: Double, imag: Double): ObjInstance {
+        val runtimeScope = scope.requireScope()
+        val instance = complexClass.createInstance(runtimeScope)
+        complexClass.initializeInstance(
+            instance,
+            Arguments(ObjReal.of(real), ObjReal.of(imag)),
+            runConstructors = false
+        )
+        return instance
+    }
 
     private fun ScopeFacade.decimalToReal(value: Obj): Double =
         ObjDecimalSupport.toDoubleOrNull(value)
diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjDecimalSupport.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjDecimalSupport.kt
index cda492a..5b92444 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjDecimalSupport.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjDecimalSupport.kt
@@ -54,19 +54,23 @@ object ObjDecimalSupport {
             instance.kotlinInstanceData = zero
         }
         decimalClass.addFn("plus") {
-            OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Plus)
+            ObjComplexSupport.decimalBinary(this, thisObj, args.firstAndOnly(), InteropOperator.Plus)
+                ?: OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Plus)
                 ?: newInstance(decimalClass, valueOf(thisObj).plus(coerceArg(requireScope(), args.firstAndOnly())))
         }
         decimalClass.addFn("minus") {
-            OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Minus)
+            ObjComplexSupport.decimalBinary(this, thisObj, args.firstAndOnly(), InteropOperator.Minus)
+                ?: OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Minus)
                 ?: newInstance(decimalClass, valueOf(thisObj).minus(coerceArg(requireScope(), args.firstAndOnly())))
         }
         decimalClass.addFn("mul") {
-            OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Mul)
+            ObjComplexSupport.decimalBinary(this, thisObj, args.firstAndOnly(), InteropOperator.Mul)
+                ?: OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Mul)
                 ?: newInstance(decimalClass, valueOf(thisObj).times(coerceArg(requireScope(), args.firstAndOnly())))
         }
         decimalClass.addFn("div") {
-            OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Div)
+            ObjComplexSupport.decimalBinary(this, thisObj, args.firstAndOnly(), InteropOperator.Div)
+                ?: OperatorInteropRegistry.invokeBinary(requireScope(), thisObj, args.firstAndOnly(), InteropOperator.Div)
                 ?: newInstance(decimalClass, divideWithContext(valueOf(thisObj), coerceArg(requireScope(), args.firstAndOnly()), currentDivisionMode(requireScope())))
         }
         decimalClass.addFn("mod") {
diff --git a/lynglib/src/commonTest/kotlin/net/sergeych/lyng/ComplexModuleTest.kt b/lynglib/src/commonTest/kotlin/net/sergeych/lyng/ComplexModuleTest.kt
index 43f7da9..a60f749 100644
--- a/lynglib/src/commonTest/kotlin/net/sergeych/lyng/ComplexModuleTest.kt
+++ b/lynglib/src/commonTest/kotlin/net/sergeych/lyng/ComplexModuleTest.kt
@@ -97,6 +97,15 @@ class ComplexModuleTest {
             assert( 5 + 1.d.i is Complex )
             assert( 5.d + 1.i is Complex )
             assert( 5.d + 2.d.i is Complex )
+            assertEquals("0.0+1.0i", 1.d.i.toString())
+            assertEquals("1.0+0.0i", 1.d.re.toString())
+            
+            var c = 1 + 2.i
+            assert(c is Complex)
+            assertEquals("1.0+2.0i", c.toString())
+        
+            c = 1.d + 2.i
+            assertEquals("1.0+2.0i", c.toString())
         """.trimIndent()
         )
     }
diff --git a/lynglib/src/commonTest/kotlin/net/sergeych/lyng/DecimalModuleTest.kt b/lynglib/src/commonTest/kotlin/net/sergeych/lyng/DecimalModuleTest.kt
index 1d06af0..0e6cdf8 100644
--- a/lynglib/src/commonTest/kotlin/net/sergeych/lyng/DecimalModuleTest.kt
+++ b/lynglib/src/commonTest/kotlin/net/sergeych/lyng/DecimalModuleTest.kt
@@ -308,4 +308,5 @@ class DecimalModuleTest {
             assertEquals(10,t)
         """.trimIndent())
     }
+
 }