diff --git a/mapytex/calculus/core/typing/add.py b/mapytex/calculus/core/typing/add.py
index 43334c8..9e6ae54 100644
--- a/mapytex/calculus/core/typing/add.py
+++ b/mapytex/calculus/core/typing/add.py
@@ -21,7 +21,7 @@ add_doc = """ Add MOs
 
 :param left: left MO
 :param right: right MO
-:returns: Tree or MO
+:returns: MO
 
 """
 
diff --git a/mapytex/calculus/core/typing/divide.py b/mapytex/calculus/core/typing/divide.py
index c0d4567..ad1b191 100644
--- a/mapytex/calculus/core/typing/divide.py
+++ b/mapytex/calculus/core/typing/divide.py
@@ -18,7 +18,7 @@ divide_doc = """ Typing trees a divide root
 
 :param left: left MO
 :param right: right MO
-:returns: Tree or MO
+:returns: MO
 
 """
 
diff --git a/mapytex/calculus/core/typing/multiply.py b/mapytex/calculus/core/typing/multiply.py
index 56c43a2..73d7f25 100644
--- a/mapytex/calculus/core/typing/multiply.py
+++ b/mapytex/calculus/core/typing/multiply.py
@@ -20,7 +20,7 @@ multiply_doc = """ Multiply MOs
 
 :param left: left MO
 :param right: right MO
-:returns: Tree or MO
+:returns: MO
 
 """
 
@@ -60,12 +60,8 @@ def moscalar_mostrpower(left, right):
 
     >>> a = MOnumber(4)
     >>> x = MOstrPower('x', 4)
-    >>> print(multiply(a, x))
-    *
-     > 4
-     > ^
-     | > x
-     | > 4
+    >>> multiply(a, x)
+    <MOMonomial 4x^4>
 
     """
     return MOMonomial(left, right)
@@ -76,12 +72,8 @@ def mostrpower_moscalar(left, right):
 
     >>> a = MOnumber(4)
     >>> x = MOstrPower('x', 4)
-    >>> print(multiply(x, a))
-    *
-     > 4
-     > ^
-     | > x
-     | > 4
+    >>> multiply(x, a)
+    <MOMonomial 4x^4>
 
     """
     return MOMonomial(right, left)
diff --git a/mapytex/calculus/core/typing/power.py b/mapytex/calculus/core/typing/power.py
index 07f3ae8..4ac7e5a 100644
--- a/mapytex/calculus/core/typing/power.py
+++ b/mapytex/calculus/core/typing/power.py
@@ -19,14 +19,14 @@ power_doc = """ Typing Power of MOs
 
 :param left: left MO
 :param right: right MO
-:returns: Tree or MO
+:returns: MO
 
 """
 
 power = Dispatcher("power", doc=power_doc)
 
 @power.register(MOstr, MOnumber)
-def monumber_monumber(left, right):
+def mostr_monumber(left, right):
     """ Create MOstrPower over powered MOstr
 
     >>> a = MOstr("x")