diff --git a/lib/js/runtime.sx b/lib/js/runtime.sx
index 12cfa681..ef44de7a 100644
--- a/lib/js/runtime.sx
+++ b/lib/js/runtime.sx
@@ -174,6 +174,28 @@
       ((= name "js-math-sign") "sign")
       ((= name "js-math-cbrt") "cbrt")
       ((= name "js-math-hypot") "hypot")
+      ((= name "js-math-sin") "sin")
+      ((= name "js-math-cos") "cos")
+      ((= name "js-math-tan") "tan")
+      ((= name "js-math-asin") "asin")
+      ((= name "js-math-acos") "acos")
+      ((= name "js-math-atan") "atan")
+      ((= name "js-math-atan2") "atan2")
+      ((= name "js-math-sinh") "sinh")
+      ((= name "js-math-cosh") "cosh")
+      ((= name "js-math-tanh") "tanh")
+      ((= name "js-math-asinh") "asinh")
+      ((= name "js-math-acosh") "acosh")
+      ((= name "js-math-atanh") "atanh")
+      ((= name "js-math-exp") "exp")
+      ((= name "js-math-log") "log")
+      ((= name "js-math-log2") "log2")
+      ((= name "js-math-log10") "log10")
+      ((= name "js-math-expm1") "expm1")
+      ((= name "js-math-log1p") "log1p")
+      ((= name "js-math-clz32") "clz32")
+      ((= name "js-math-imul") "imul")
+      ((= name "js-math-fround") "fround")
       ((= name "js-number-is-finite") "isFinite")
       ((= name "js-number-is-nan") "isNaN")
       ((= name "js-number-is-integer") "isInteger")
diff --git a/lib/js/test262-scoreboard.json b/lib/js/test262-scoreboard.json
index 4d985772..77eca860 100644
--- a/lib/js/test262-scoreboard.json
+++ b/lib/js/test262-scoreboard.json
@@ -1,45 +1,27 @@
 {
   "totals": {
-    "pass": 44,
-    "fail": 6,
-    "skip": 0,
+    "pass": 45,
+    "fail": 0,
+    "skip": 5,
     "timeout": 0,
     "total": 50,
-    "runnable": 50,
-    "pass_rate": 88.0
+    "runnable": 45,
+    "pass_rate": 100.0
   },
   "categories": [
     {
-      "category": "built-ins/Object",
+      "category": "built-ins/Math",
       "total": 50,
-      "pass": 44,
-      "fail": 6,
-      "skip": 0,
+      "pass": 45,
+      "fail": 0,
+      "skip": 5,
       "timeout": 0,
-      "pass_rate": 88.0,
-      "top_failures": [
-        [
-          "ReferenceError (undefined symbol)",
-          4
-        ],
-        [
-          "SyntaxError (parse/unsupported syntax)",
-          2
-        ]
-      ]
+      "pass_rate": 100.0,
+      "top_failures": []
     }
   ],
-  "top_failure_modes": [
-    [
-      "ReferenceError (undefined symbol)",
-      4
-    ],
-    [
-      "SyntaxError (parse/unsupported syntax)",
-      2
-    ]
-  ],
+  "top_failure_modes": [],
   "pinned_commit": "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33",
-  "elapsed_seconds": 42.1,
+  "elapsed_seconds": 9.0,
   "workers": 1
 }
\ No newline at end of file
diff --git a/lib/js/test262-scoreboard.md b/lib/js/test262-scoreboard.md
index 5da4c0fb..89ffc358 100644
--- a/lib/js/test262-scoreboard.md
+++ b/lib/js/test262-scoreboard.md
@@ -1,24 +1,17 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 42.1s
+Wall time: 9.0s
 
-**Total:** 44/50 runnable passed (88.0%). Raw: pass=44 fail=6 skip=0 timeout=0 total=50.
+**Total:** 45/45 runnable passed (100.0%). Raw: pass=45 fail=0 skip=5 timeout=0 total=50.
 
 ## Top failure modes
 
-- **4x** ReferenceError (undefined symbol)
-- **2x** SyntaxError (parse/unsupported syntax)
 
 ## Categories (worst pass-rate first, min 10 runnable)
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
-| built-ins/Object | 44 | 6 | 0 | 0 | 50 | 88.0% |
+| built-ins/Math | 45 | 0 | 5 | 0 | 50 | 100.0% |
 
 ## Per-category top failures (min 10 runnable, worst first)
-
-### built-ins/Object  (44/50 — 88.0%)
-
-- **4x** ReferenceError (undefined symbol)
-- **2x** SyntaxError (parse/unsupported syntax)
diff --git a/plans/js-on-sx.md b/plans/js-on-sx.md
index f994140c..48480641 100644
--- a/plans/js-on-sx.md
+++ b/plans/js-on-sx.md
@@ -158,6 +158,8 @@ Each item: implement → tests → update progress. Mark `[x]` when tests green.
 
 Append-only record of completed iterations. Loop writes one line per iteration: date, what was done, test count delta.
 
+- 2026-05-08 — **`Math.X.name` returns the JS-style method name.** `Math.acos.name`, `Math.acosh.name`, `Math.asin.name` were returning the SX symbol name (`"js-math-acos"` etc.). `js-unmap-fn-name` had mappings for the older Math methods but not the trig/hyperbolic/log family added later. Added mappings for sin, cos, tan, asin, acos, atan, atan2, sinh, cosh, tanh, asinh, acosh, atanh, exp, log, log2, log10, expm1, log1p, clz32, imul, fround. built-ins/Math: 42/45 → 45/45 (100%). conformance.sh: 148/148.
+
 - 2026-05-08 — **`fn.constructor === Function` for function instances.** Per ES, every function instance's `constructor` slot points to the `Function` global. Was returning undefined for `(function () {}).constructor`. Added `constructor` to the function-property cond in `js-get-prop`; returns `js-function-global`. Headline scoreboards unchanged (the test that reads it also has unsupported features), but the fix unblocks future tests that check constructor identity. conformance.sh: 148/148.
 
 - 2026-05-08 — **`js-new-call` honours function-typed constructor returns (not just dict/list).** `new Object(func)` should return `func` itself per ES spec ("if value is a native ECMAScript object, return it"), but `js-new-call` only kept the constructor's return when it was dict/list — functions fell through to the empty wrapper. Added `(js-function? ret)` to the accept set. Now `new Object(fn) === fn` and `new Object(fn)()` invokes `fn`. built-ins/Object: 42/50 → 44/50. conformance.sh: 148/148.