{"title": "A Mental Arithmetic, Upon the Inductive Plan: With Easy Exercises for the Slate", "covers": [6143306], "key": "/works/OL7552162W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2310924A"}}], "type": {"key": "/type/work"}, "subjects": ["Mental arithmetic"], "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2009-12-10T21:23:45.458994"}, "last_modified": {"type": "/type/datetime", "value": "2026-07-10T13:30:45.890235"}}