How Can Teachers Use It?
Considering that this resource is apparently not core-aligned and hard to understand for all but the most conversant mathematicians in the class, you should probably limit use to advanced individual reference or reserve it for AP classes focusing on advanced terminology.
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What's It Like?
Mathwords provides easily-to-locate, formal definitions for about 2000 mathematic terms including a few from physics, finance, and modeling. Most definitions contain multiple references to other terms plus either diagrams or examples, but fewer have textual explanations. About 20 terms are accompanied by a dynamic diagram from McGraw-Hill's Geometer's Sketchpad, and 36 terms populate the real-world application list. Terms can be accessed using four search methods: A to Z, full list, subject areas, or Google powered native-and-paid-web-sites search.
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Is It Good For Learning?
If you just need a little nudge to remember a concept or term you already knew and understood, Mathwords will be a helpful reference. If you don't already have a really strong foundation, it could be quite frustrating. It seems like kids who can easily understand these definitions wouldn't need to look them up here in the first place. For example, multiple careful readings of the interrelated terms accuracy, precise, and significant digits built some understanding but raised unanswered questions as well. A comparison of two definitions of function, the first from the Common Core Standards, demonstrates the problems inherent in Mathwords's formal and reference-laden approach.
Common Core: "A function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output."
Mathwords: "function: A relation for which each element of the domain corresponds to exactly one element of the range."
You have to look up four other words to understand Mathwords' definition, which is a lot of work. Even with this formal approach intact, expanded definitions with better examples and diagrams would improve learning significantly.
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Definition for precision begins with an informal yet vague definition, follows with two references, a note, and a textual example.
Significant digits definition is overly vague.
Angle definition is formally accurate but lacks visual cues to identify the space physically.
Definition for inverse tangent is short and sweet but following textual explanation does not encourage comprehension.
JavaSketchPad dynamic diagram for angle bisector allows you to manipulate but does not define or explain.
