This no cost easy to use, trilingual (English, Spanish and French) website tells where and how 1,000 commonly used mathematics terms are being used in elementary and secondary school student textbooks series. The 135,000 pieces of information are displayed in spreadsheet format by term and in grade level order.
Additional information can be had by going to K-12math.info's history site.
Select one of the following:
Whole number, Fraction, Decimal, Integer, Rational Number, Real Number, Complex Number
Measurement, Standard Units, Length, Area, Volume
Point, Line, Angle, Triangle, Quadrilateral, Polygon, Circle, Plane
Polyhedron, Trigonometry, Vector, Transformation Geometry, Topology, Other Geometries