diff --git a/src/value/mod.rs b/src/value/mod.rs
index 005debf..d6bcc0d 100644
--- a/src/value/mod.rs
+++ b/src/value/mod.rs
@@ -160,6 +160,7 @@ impl Value {
                 Op::Rem => *lhs % *rhs,
                 _ => Ok(Self::BinaryOp(lhs, op, rhs)),
             },
+            Self::Paren(v) => v.eval(),
             _ => Ok(self),
         }
     }
diff --git a/src/value/ops.rs b/src/value/ops.rs
index 447bf85..a7d5df2 100644
--- a/src/value/ops.rs
+++ b/src/value/ops.rs
@@ -50,6 +50,9 @@ impl Add for Value {
                     Value::Ident(format!("{}{}{}", num, unit, s), quotes)
                 }
                 Self::Null => Value::Ident(format!("{}{}", num, unit), QuoteKind::None),
+                Self::List(..) => {
+                    Value::Ident(format!("{}{}{}", num, unit, other), QuoteKind::None)
+                }
                 _ => {
                     return Err(
                         format!("Undefined operation \"{}{} + {}\".", num, unit, other).into(),
@@ -64,9 +67,10 @@ impl Add for Value {
                     Value::Ident(format!("{}{}", c, s), QuoteKind::None)
                 }
                 Self::Null => Value::Ident(c.to_string(), QuoteKind::None),
+                Self::List(..) => Value::Ident(format!("{}{}", c, other), QuoteKind::None),
                 _ => return Err(format!("Undefined operation \"{} + {}\".", c, other).into()),
             },
-            Self::BinaryOp(..) | Self::Paren(..) => self.eval()?,
+            Self::BinaryOp(..) | Self::Paren(..) => (self.eval()? + other)?,
             Self::Ident(s1, quotes1) => match other {
                 Self::Ident(s2, quotes2) => {
                     let quotes = match (quotes1, quotes2) {
@@ -99,9 +103,20 @@ impl Add for Value {
                     };
                     Value::Ident(format!("{}{}", s1, c), quotes)
                 }
-                Self::BinaryOp(..) | Self::Paren(..) | Self::List(..) => todo!(),
+                Self::List(..) => Value::Ident(format!("{}{}", s1, other), quotes1),
+                Self::BinaryOp(..) | Self::Paren(..) => todo!(),
             },
-            _ => todo!(),
+            Self::List(..) => match other {
+                Self::Ident(s, q) => {
+                    let quotes = match q {
+                        QuoteKind::Double | QuoteKind::Single => QuoteKind::Double,
+                        QuoteKind::None => QuoteKind::None,
+                    };
+                    Value::Ident(format!("{}{}", self, s), quotes)
+                }
+                Self::Paren(..) => (self + other.eval()?)?,
+                _ => Value::Ident(format!("{}{}", self, other), QuoteKind::None),
+            }
         })
     }
 }
@@ -133,6 +148,9 @@ impl Sub for Value {
                         )
                     }
                 }
+                Self::List(..) => {
+                    Value::Ident(format!("{}{}-{}", num, unit, other), QuoteKind::None)
+                }
                 _ => todo!(),
             },
             Self::Color(c) => match other {
@@ -149,7 +167,7 @@ impl Sub for Value {
                 }
                 _ => Value::Ident(format!("{}-{}", c, other), QuoteKind::None),
             },
-            Self::BinaryOp(..) | Self::Paren(..) => self.eval()?,
+            Self::BinaryOp(..) | Self::Paren(..) => (self.eval()? - other)?,
             Self::Ident(s1, quotes1) => match other {
                 Self::Ident(s2, quotes2) => {
                     let quotes1 = match quotes1 {
@@ -186,8 +204,26 @@ impl Sub for Value {
                     };
                     Value::Ident(format!("{}{}{}-", quotes, s1, quotes), QuoteKind::None)
                 }
+                Self::List(..) => {
+                    let quotes = match quotes1 {
+                        QuoteKind::Double | QuoteKind::Single => QuoteKind::Double,
+                        QuoteKind::None => QuoteKind::None,
+                    };
+                    Value::Ident(format!("{}{}{}-{}", quotes, s1, quotes, other), QuoteKind::None)
+                }
                 _ => todo!(),
             },
+            Self::List(..) => match other {
+                Self::Ident(s, q) => {
+                    let quotes = match q {
+                        QuoteKind::Double | QuoteKind::Single => QuoteKind::Double,
+                        QuoteKind::None => QuoteKind::None,
+                    };
+                    Value::Ident(format!("{}-{}{}{}", self, quotes, s, quotes), QuoteKind::None)
+                }
+                Self::Paren(..) => (self + other.eval()?)?,
+                _ => Value::Ident(format!("{}-{}", self, other), QuoteKind::None),
+            }
             _ => match other {
                 Self::Ident(s, quotes) => {
                     let quotes = match quotes {
diff --git a/tests/values.rs b/tests/values.rs
index 02548d2..5956b61 100644
--- a/tests/values.rs
+++ b/tests/values.rs
@@ -326,12 +326,11 @@ test!(
     "a {\n  color: 1 + null;\n}\n",
     "a {\n  color: 1;\n}\n"
 );
-// blocked on proper parsing of binary ops
-// test!(
-//     unitless_plus_null_plus_unitless,
-//     "a {\n  color: 1 + null + 1;\n}\n",
-//     "a {\n  color: 11;\n}\n"
-// );
+test!(
+    unitless_plus_null_plus_unitless,
+    "a {\n  color: 1 + null + 1;\n}\n",
+    "a {\n  color: 11;\n}\n"
+);
 test!(
     unit_plus_null,
     "a {\n  color: 1px + null;\n}\n",
@@ -388,3 +387,79 @@ test!(
     "a {\n  color: foo + 1 + bar + 2;\n}\n",
     "a {\n  color: foo1bar2;\n}\n"
 );
+test!(
+    many_parens,
+    "a {\n  color: (((((red)))));\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+
+test!(
+    num_plus_list,
+    "a {\n  color: 1 + (2 3);\n}\n",
+    "a {\n  color: 12 3;\n}\n"
+);
+test!(
+    list_plus_num,
+    "a {\n  color: (1 2) + 3;\n}\n",
+    "a {\n  color: 1 23;\n}\n"
+);
+test!(
+    num_minus_list,
+    "a {\n  color: 1 - (2 3);\n}\n",
+    "a {\n  color: 1-2 3;\n}\n"
+);
+test!(
+    list_minus_num,
+    "a {\n  color: (1 2) - 3;\n}\n",
+    "a {\n  color: 1 2-3;\n}\n"
+);
+test!(
+    dblquoted_plus_list,
+    "a {\n  color: \"1\" + (2 3);\n}\n",
+    "a {\n  color: \"12 3\";\n}\n"
+);
+test!(
+    list_plus_dblquoted,
+    "a {\n  color: (1 2) + \"3\";\n}\n",
+    "a {\n  color: \"1 23\";\n}\n"
+);
+test!(
+    dblquoted_minus_list,
+    "a {\n  color: \"1\" - (2 3);\n}\n",
+    "a {\n  color: \"1\"-2 3;\n}\n"
+);
+test!(
+    list_minus_dblquoted,
+    "a {\n  color: (1 2) - \"3\";\n}\n",
+    "a {\n  color: 1 2-\"3\";\n}\n"
+);
+test!(
+    sglquoted_plus_list,
+    "a {\n  color: 'a' + (b c);\n}\n",
+    "a {\n  color: \"ab c\";\n}\n"
+);
+test!(
+    list_plus_sglquoted,
+    "a {\n  color: (b c) + 'a';\n}\n",
+    "a {\n  color: \"b ca\";\n}\n"
+);
+test!(
+    sglquoted_minus_list,
+    "a {\n  color: 'a' - (b c);\n}\n",
+    "a {\n  color: \"a\"-b c;\n}\n"
+);
+test!(
+    list_minus_sglquoted,
+    "a {\n  color: (b c) - 'a';\n}\n",
+    "a {\n  color: b c-\"a\";\n}\n"
+);
+test!(
+    list_plus_list,
+    "a {\n  color: (a b) + (1 2);\n}\n",
+    "a {\n  color: a b1 2;\n}\n"
+);
+test!(
+    list_minus_list,
+    "a {\n  color: (a b) - (1 2);\n}\n",
+    "a {\n  color: a b-1 2;\n}\n"
+);