diff --git a/mapytex/calculus/core/compute/multiply.py b/mapytex/calculus/core/compute/multiply.py
index 2fc572c..8ba3da4 100644
--- a/mapytex/calculus/core/compute/multiply.py
+++ b/mapytex/calculus/core/compute/multiply.py
@@ -15,6 +15,7 @@ from ..tree import Tree
 from ..MO.mo import MO, MOnumber, MOstr
 from ..MO.fraction import MOFraction
 from ..MO.monomial import MOstrPower, MOMonomial
+from ..MO.polynomial import MOpolynomial
 from .filters import special_case
 
 multiply_doc = """ Multiply MOs
@@ -419,6 +420,141 @@ def momonomial_momonomial(left, right):
     coefs = Tree("*", left.coefficient, right.coefficient)
     return Tree("*", coefs, monome)
 
+@multiply.register((MOnumber, MOFraction, MOstr, MOstrPower, MOMonomial), \
+                   MOpolynomial)
+@special_case(multiply_filter)
+def moscalar_mopolynomial(left, right):
+    """ Multiply a scalar and a MOMonomial
+
+    >>> a = MOnumber(2)
+    >>> b = MOpolynomial('x', [1, 2, 3])
+    >>> print(multiply(a, b))
+    +
+     > *
+     | > 2
+     | > 1
+     > +
+     | > *
+     | | > 2
+     | | > *
+     | | | > 2
+     | | | > x
+     | > *
+     | | > 2
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+    >>> a = MOFraction(1, 5)
+    >>> b = MOpolynomial('x', [1, 2, 3])
+    >>> print(multiply(a, b))
+    +
+     > *
+     | > /
+     | | > 1
+     | | > 5
+     | > 1
+     > +
+     | > *
+     | | > /
+     | | | > 1
+     | | | > 5
+     | | > *
+     | | | > 2
+     | | | > x
+     | > *
+     | | > /
+     | | | > 1
+     | | | > 5
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+    >>> a = MOstr("x")
+    >>> b = MOpolynomial('x', [1, 2, 3])
+    >>> print(multiply(a, b))
+    +
+     > *
+     | > x
+     | > 1
+     > +
+     | > *
+     | | > x
+     | | > *
+     | | | > 2
+     | | | > x
+     | > *
+     | | > x
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+    >>> a = MOstrPower("x", 2)
+    >>> b = MOpolynomial('x', [1, 2, 3])
+    >>> print(multiply(a, b))
+    +
+     > *
+     | > ^
+     | | > x
+     | | > 2
+     | > 1
+     > +
+     | > *
+     | | > ^
+     | | | > x
+     | | | > 2
+     | | > *
+     | | | > 2
+     | | | > x
+     | > *
+     | | > ^
+     | | | > x
+     | | | > 2
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+    >>> a = MOMonomial(3, "x", 2)
+    >>> b = MOpolynomial('x', [1, 2, 3])
+    >>> print(multiply(a, b))
+    +
+     > *
+     | > *
+     | | > 3
+     | | > ^
+     | | | > x
+     | | | > 2
+     | > 1
+     > +
+     | > *
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+     | | > *
+     | | | > 2
+     | | | > x
+     | > *
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+     | | > *
+     | | | > 3
+     | | | > ^
+     | | | | > x
+     | | | | > 2
+    """
+    coefs = [Tree("*", left, monom) for monom in right.monomials.values()]
+    return Tree.from_list("+", coefs)
+
+
 # -----------------------------
 # Reglages pour 'vim'
 # vim:set autoindent expandtab tabstop=4 shiftwidth=4: