The following terms are developed and/or defined in this grade level's materials.

ADD BY REGROUPING (WHOLE NUMBER)  FREQUENCY TABLE  PROBLEM SOLVING 
ADDITION (FRACTION)  HEXAGON  QUADRILATERAL 
ANGLE  IDENTITY (ADDITION)  RAY 
AREA  IDENTITY (MULT.)  RECTANGLE 
ARRAY (MULT.) (WHOLE)  INEQUALITY SIGN  RECTANGLE (AREA) 
ASSOCIATIVE (ADDITION)  LINE  RHOMBUS 
BAR GRAPH  LINE SEGMENT  RIGHT ANGLE 
COMMUTATIVE (ADDITION)  NUMERATOR  RIGHT TRIANGLE 
DENOMINATOR  ORDER OF OPERATIONS  ROUNDING 
DISTRIBUTIVE (WHOLE)  PARALLEL LINES  SQUARE 
DIVISION (WHOLE)  PENTAGON  SYMBOLS FOR MULTIPLICATION. 
DIVISOR, QUOTIENT  PERIMETER  TIME 
EQUATION  PERPENDICULAR LINES  TRAPEZOID 
EQUIVALENT FRACTIONS  PICTOGRAPH  VARIABLE 
ESTIMATING SUMS  PLACE VALUE  VERTEX (ANGLE) 
EVEN AND ODD NUMBER  POINT  
FACTOR (WHOLE)  POLYGON  
  
  
  
  
  
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 AND SUBTRACTION RELATION  MEASUREMENT (LENGTH  REPEATED SUBT. 
ADDEND (WHOLE)  MULT. AND DIVISION RELATION  RULER 
ADDITION (WHOLE)  MULT. PROPERTIES  SET 
COLLECTING  MULTIPLES OF TEN  SHAPE 
CURVE  MULTIPLICATION (WHOLE)  SUBTRACTION 
DIVISION BY ZERO  NUMBER LINE  SYMBOLS FOR ADDITION 
DIVISION WITH NUMBER LINE  NUMBER LINE (FRACTION)  SYMBOLS FOR DIVSION 
FRACTION  NUMBER SENTENCE  TRIANGLE 
INCH  ORDERING (NUMBERS)  TRUE AND FALSE 
INTERPRETATION  ORDINAL NUMBER  UNKNOWN 
INTERSECTING LINES  REMAINDER  WHOLE NUMBER 
MEASUREMENT  REPEATED ADDITION  WRITING NUMBERS 
  
  
  
  
  
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A synonym may also be used because these historical terms may have been replaced by a new vocabulary (k12math.info's list of 1,000 terms has not changed in 40 years).
Wiktionary dictonary may help here.

ADD. COMBINATIONS (WHOLE)  INEQUALITY (FRACTION)  SYMBOLS OF GROUPING 
ALGEBRAIC EXPRESSIONS  MULT. COMBINATIONS  THREE ADDENDS 
CONGRUENT PARTS (FRACTION)  MULTIPLES OF TWO  WORD PROBLEMS (WHOLE) 
DIVISION COMBINATIONS  PERIMETER (QUADRILATERAL)  
INEQUALITY (NUMBERS)  PIE APPROACH (FRACTION)  
  