CK-12.org's second grade math textbook

Ck-12.org's Second grade math textbook (7 year old) - a view by k-12math.info
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The following terms are developed and/or defined in this grade level's materials.
ADD AND SUBTRACTION RELATION	EVEN AND ODD NUMBER	PLACE VALUE
ADD BY REGROUPING	FOOT (MEASUREMENT)	PROBLEM SOLVING
ADDEND (WHOLE)	IDENTITY (ADDITION)	TIME
BAR GRAPH	INEQUALITY SIGN	VERTICES (SOLIDS)





The following terms appear in this grade level's materials. At this grade level the terms are used in the lesson proper in examples or illustrations. The purpose here is to reinforce understanding of the terms.
ADD BY NUMBER LINE	EQUATION	RECTANGULAR PRISM
ADDITION (WHOLE)	FACE (POLYHEDRON)	REPEATED ADDITION
ANGLE	FREQUENCY TABLE	RULER
CENTER (CIRCLE)	HEXAGON	SHAPE
CENTIMETER	INCH	SPHERE
CIRCLE	LENGTH	SQUARE
COLLECTING	MEASUREMENT	SUBT. (TWO PLACE)
COLUMN ADDITION	MEASUREMENT (LENGTH	SUBTRACTION
COMMUTATIVE (ADD.)	MONEY	SYMBOLS FOR ADDITION
COMPARISON	MULTIPLICATION (WHOLE)	SYMBOLS FOR MULTIPLICATION.
COMPASS	NUMBER SENTENCE	TABLES
CONE	ONE HALF	THREE ADDENDS
COUNTING	ORDINAL NUMBER	THREE DIMENSION
CUBE	PENTAGON	TRIANGLE
CYLINDER	POINT	TRUE AND FALSE
DIVISION (WHOLE)	QUADRILATERAL	WRITING NUMBERS
EDGE (POLYHEDRON)	RECTANGLE





A synonym of the following terms are used. The synonym helps to bridge the learner's non mathematical experiences to mathematics terms that will more formally be worked on. A synonym may also be used because these historical terms may have been replaced by a new vocabulary (k-12math.info's list of 1,000 terms has not changed in 40 years). Wiktionary dictonary may help here.
ADD. COMBINATIONS (WHOLE)	INEQUALITY	MULTIPLES OF TWO
APPROXIMATION	INTERPRETATION	PICTOGRAPH
EQUALITY	MULTIPLES OF TEN	WORD PROBLEMS (WHOLE)
ESTIMATING SUMS

K-12math.info selected the content that appears here. All terms appear in the lesson proper. The selection process is based upon a content analysis of 2013 to advance copies of 2015 student mathematics textbook series. Series that base their content on 2010 and/or 2012 standards. The analysis also included content that was felt would be needed for the transistion to CK-12 existing textbook series.

Editor's Note: This is a very basic outline of the content and how they are to be developed in the lesson proper. These terms need to be used in examples, illustrations, class activities and homework to help further understand them.

Resources:
Learners age 5 to 11 Grades K through 6 (from Wikieducator's "Come fly with me..." project).
Teaching OER Mathematics.
Learning design a Wikieducator.org project.

Additional observations made while collecting information for this site on unit development in a textbook:

One type has a chapter unit divided into 3 parts:
Part 1 has a written explanation of the concept being developed (or defined).
Part 2 has examples and illustrations of the concept.
Part 3 classroom and/or homework activities.

Another approach consists of 2 parts:
Part 1: the concept being developed (or defined) is being used in several carefully designed examples and illustrations.
Part 2: classroom and/or homework activities.