Spelling fixes (#2902)

diff --git a/Lib/test/decimaltestdata/divide.decTest b/Lib/test/decimaltestdata/divide.decTest
index efbb5ba..a51aa5d 100644
--- a/Lib/test/decimaltestdata/divide.decTest
+++ b/Lib/test/decimaltestdata/divide.decTest
@@ -759,7 +759,7 @@
 
 -- overflow and underflow (additional edge tests in multiply.decTest)
 -- 'subnormal' results now possible (all hard underflow or overflow in
--- base arithemtic)
+-- base arithmetic)
 divx960 divide 1e-600000000 1e+400000001 -> 1E-1000000001 Subnormal
 divx961 divide 1e-600000000 1e+400000002 -> 1E-1000000002 Subnormal
 divx962 divide 1e-600000000 1e+400000003 -> 1E-1000000003 Subnormal