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 RELATIONEVEN 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.
COMPASSNUMBER 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 A synonym may also be used because these historical terms may have been replaced by a new vocabulary (k-12math.info's list of 1,000 terms has not changed in 40 years).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).
Key points in Writing a textbook. (Especially step 7)
Teaching OER Mathematics.
Learning design a Wikieducator.org project.


Additional observations made while collecting information for this site on unit development in a textbook:
  1. 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.

  2. 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.

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