diff --git a/mapytex/calculus/API/tokens/number.py b/mapytex/calculus/API/tokens/number.py
index 1c37949..b2cd9db 100644
--- a/mapytex/calculus/API/tokens/number.py
+++ b/mapytex/calculus/API/tokens/number.py
@@ -10,10 +10,12 @@
 Tokens representing interger and decimal
 
 """
+from decimal import Decimal as _Decimal
+from random import random, randint
 from .token import Token
+from ...core.arithmetic import gcd
 from ...core.MO import MO, MOnumber
 from ...core.MO.fraction import MOFraction
-from decimal import Decimal as _Decimal
 
 __all__ = ["Integer", "Decimal"]
 
@@ -51,17 +53,49 @@ class Integer(Token):
         return cls(mo, name, ancestor)
 
     @classmethod
-    def random(cls):
-        raise NotImplemented
+    def random(cls, 
+               name = "",
+               min_value = -10, 
+               max_value = 10,
+               rejected = [0, 1],
+               reject_callbacks=[],
+               ):
+        """ Generate a random Integer
+
+        :param name: name of the Integer
+        :param min_value: minimum value
+        :param max_value: maximum value
+        :param rejected: rejected values
+        :param reject_callbacks: list of function for value rejection
+
+        """
+        conditions = [lambda x: x in rejected] + reject_callbacks
+
+        candidate = randint(min_value, max_value)
+        while any(c(candidate) for c in conditions):
+            candidate = randint(min_value, max_value)
+
+        return Integer(candidate, name)
 
 class Decimal(Token):
 
-    """ Token representing a decimal """
+    """ Token representing a decimal 
+    
+    :example:
+    >>> Decimal("4.3")
+    <Decimal 4.3>
+    >>> Decimal(3.3)
+    <Decimal 3.29999999999999982236431605997495353221893310546875>
+    >>> Decimal(_Decimal("2.3"))
+    <Decimal 2.3>
+    """
 
     def __init__(self, a, name="", ancestor=None):
         if not isinstance(a, MO):
-            if isinstance(a, (str, float)):
-                mo = MOnumber(Decimal(a))
+            if isinstance(a, _Decimal):
+                mo = MOnumber(a)
+            elif isinstance(a, (str, float)):
+                mo = MOnumber(_Decimal(a))
             else:
                 raise TypeError
         else:
@@ -80,12 +114,43 @@ class Decimal(Token):
         return cls(mo, name, ancestor)
 
     @classmethod
-    def random(cls):
-        raise NotImplemented
+    def random(cls,
+               name= "",
+               min_value = -10, 
+               max_value = 10,
+               digits = 2,
+               rejected = [0, 1],
+               reject_callbacks=[],
+               ):
+        """ Generate a random Decimal
+
+        :param name: name of the Integer
+        :param min_value: minimum value
+        :param max_value: maximum value
+        :param digits: digits after comas
+        :param rejected: rejected values
+        :param reject_callbacks: list of function for value rejection
+
+        """
+        conditions = [lambda x: x in rejected] + reject_callbacks
+
+        float_cand = (max_value - min_value)*random() + min_value
+        candidate = _Decimal(f"{float_cand:.{digits}f}")
+        while any(c(candidate) for c in conditions):
+            float_cand = (max_value - min_value)*random() + min_value
+            candidate = _Decimal(f"{float_cand:.{digits}f}")
+
+        return Decimal(candidate, name)
+
 
 class Fraction(Token):
 
-    """ Token representing a fraction """
+    """ Token representing a fraction
+
+    :example:
+    >>> Fraction("3/4")
+    <Fraction 3 / 4>
+    """
 
     def __init__(self, a, name="", ancestor=None):
         if not isinstance(a, MO):
@@ -112,8 +177,62 @@ class Fraction(Token):
         return cls(mo, name, ancestor)
 
     @classmethod
-    def random(cls):
-        raise NotImplemented
+    def random(cls,
+               name="",
+               fix_num="",
+               min_num=-10, max_num=10, rejected_num=[0],
+               reject_num_callbacks=[],
+               fix_denom="",
+               min_denom=-10, max_denom=10, rejected_denom=[0, 1, -1],
+               reject_denom_callbacks=[],
+               irreductible=False,
+               not_integer=True
+               ):
+        """ Generate a random Fraction
+
+        :param name: Name of the fraction
+        :param fix_num: if set, the numerator will get this value
+        :param min_num: minimum value for the numerator
+        :param max_num: maximum value for the numerator
+        :param rejected_num: rejected values for the numerator
+        :param reject_num_callbacks: list of function for numerator rejection
+        :param fix_denom: if set, the denomerator will get this value
+        :param min_denom: minimum value for the denominator
+        :param max_denom: maximum value for the denominator
+        :param rejected_denom: rejected values for the denominator
+        :param reject_denom_callbacks: list of function for denomerator rejection
+        :param irreductible: is the generated fraction necessary irreductible
+        :param not_integer: can the generated fraction be egal to an interger
+        """
+        if fix_num == "":
+            conditions = [lambda x: x in rejected_denom] + reject_num_callbacks
+
+            num = randint(min_num, max_num)
+            while any(c(num) for c in conditions):
+                num = randint(min_num, max_num)
+        else:
+            num = fix_num
+
+        if fix_denom == "":
+            conditions = [lambda x: x in rejected_denom] + reject_denom_callbacks
+
+            if irreductible:
+                def not_prime_with_num(denom):
+                    return gcd(num, denom) != 1
+                conditions.append(not_prime_with_num)
+            if not_integer:
+                def divise_num(denom):
+                    return num % denom == 0
+                conditions.append(divise_num)
+
+            denom = randint(min_denom, max_denom)
+            while any(c(denom) for c in conditions) :
+                denom = randint(min_denom, max_denom)
+        else:
+            denom = fix_denom
+
+        frac = MOFraction(num, denom)
+        return cls(frac, name)
 
     @property
     def numerator(self):