diff --git a/src/decimal.jl b/src/decimal.jl
index 11da6ca..4ff71b0 100644
--- a/src/decimal.jl
+++ b/src/decimal.jl
@@ -65,6 +65,12 @@ end
 Base.zero(::Type{Decimal}) = Decimal(false, 0, 0)
 Base.one(::Type{Decimal}) = Decimal(false, 1, 0)
 
+Base.iszero(x::Decimal) = iszero(x.c)
+
+# As long as we do not support Inf/NaN
+Base.isfinite(x::Decimal) = true
+Base.isnan(x::Decimal) = false
+
 # convert a decimal to any subtype of Real
 (::Type{T})(x::Decimal) where {T<:Real} = parse(T, string(x))
 
diff --git a/test/test_decimal.jl b/test/test_decimal.jl
index 57c7c3c..4e2684e 100644
--- a/test/test_decimal.jl
+++ b/test/test_decimal.jl
@@ -80,4 +80,9 @@ end
     @test string(number(Decimal(false, 543, -1))) == "54.3"
 end
 
+@testset "Number functions" begin
+    @test isfinite(Decimal(0, 1, 1))
+    @test !isnan(Decimal(0, 1, 1))
+end
+
 end