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diff --git a/stdlib/arith-each.tl b/stdlib/arith-each.tl
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+;; Copyright 2021
+;; Kaz Kylheku <kaz@kylheku.com>
+;; Vancouver, Canada
+;; All rights reserved.
+;;
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions are met:
+;;
+;; 1. Redistributions of source code must retain the above copyright notice,
+;;    this list of conditions and the following disclaimer.
+;;
+;; 2. Redistributions in binary form must reproduce the above copyright notice,
+;;    this list of conditions and the following disclaimer in the documentation
+;;    and/or other materials provided with the distribution.
+;;
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+;; POSSIBILITY OF SUCH DAMAGE.
+
+(defmacro sum-each (vars . body)
+  (with-gensyms (accum)
+    ^(let ((,accum 0))
+       (each ,vars
+         (inc ,accum (progn ,*body)))
+       ,accum)))
+
+(defmacro sum-each* (vars . body)
+  (with-gensyms (accum)
+    ^(let ((,accum 0))
+       (each* ,vars
+         (inc ,accum (progn ,*body)))
+       ,accum)))
+
+(defmacro mul-each (vars . body)
+  (with-gensyms (accum)
+    ^(let ((,accum 1))
+       (each ,vars
+         (set ,accum (* ,accum (progn ,*body))))
+       ,accum)))
+
+(defmacro mul-each* (vars . body)
+  (with-gensyms (accum)
+    ^(let ((,accum 1))
+       (each* ,vars
+         (set ,accum (* ,accum (progn ,*body))))
+       ,accum)))