diff --git a/src/primitive.jl b/src/primitive.jl
index 0e21b4a..caff022 100644
--- a/src/primitive.jl
+++ b/src/primitive.jl
@@ -5,8 +5,18 @@ import Base: asin, acos, atan, acot, asec, acsc, asinh, acosh, atanh, acoth, ase
 import Base: sinc, cosc
 import Base: +, -, *, /, \, ^, >, <, >=, <=, ==
 import Base: hypot, max, min
+import Base: tail
 
 # Unary
+@inline +(a::Number, b::TaylorScalar) = TaylorScalar((a + value(b)[1]), tail(value(b))...)
+@inline -(a::Number, b::TaylorScalar) = TaylorScalar((a - value(b)[1]), .-tail(value(b))...)
+@inline *(a::Number, b::TaylorScalar) = TaylorScalar((a .* value(b))...)
+@inline /(a::Number, b::TaylorScalar) = /(promote(a, b)...)
+
+@inline +(a::TaylorScalar, b::Number) = TaylorScalar((value(a)[1] + b), tail(value(a))...)
+@inline -(a::TaylorScalar, b::Number) = TaylorScalar((value(a)[1] - b), tail(value(a))...)
+@inline *(a::TaylorScalar, b::Number) = TaylorScalar((value(a) .* b)...)
+@inline /(a::TaylorScalar, b::Number) = TaylorScalar((value(a) ./ b)...)
 
 ## Delegated