diff --git a/matrix.c b/matrix.c
index 29de399..3c18152 100644
--- a/matrix.c
+++ b/matrix.c
@@ -152,8 +152,44 @@ return matrix_erg;
     
     
 }
+static int can_multiply (Matrix matrix1, Matrix matrix2)
+{
+    int can_multiply = 0;
+
+    if(matrix1.cols == matrix2.rows)
+        can_multiply = 1;
+        
+    return can_multiply;
+}
+
 
 Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
+    int ok = can_multiply(matrix1,matrix2);
+    unsigned int erg_rows = matrix1.rows;
+    unsigned int erg_cols = matrix2.cols;
+    Matrix matrix_erg = createMatrix(erg_rows, erg_cols);
     
+    
+    if (ok == 1)
+    {
+
+        for (int i = 0; i < erg_rows; i++)
+        {
+            for (int j = 0; j < erg_cols; j++)
+            {
+                MatrixType sum = 0;
+                
+                for (int k = 0; k < matrix1.cols; k++)
+                {
+                    sum += matrix1.data[i * matrix1.cols + k] * matrix2.data[k * matrix2.cols + j];
+                }
+                
+                matrix_erg.data [i * erg_cols + j] = sum;
+            }
+ 
+        }
+
+        return matrix_erg;
+    }  
 }
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