Math Dictionary 23 Creative Mathematics（数学字典2 3创造性的数学）.pdf

Math Dictionary Terms for Grades 2-3: A Acute - an angle less than 90˚ Addend - one of the numbers being added in an addition problem Addition - combining quantities Algebra - a strand of mathematics in which variables are used to express rules about numbers and relationships Algorithm - a step-by-step procedure for math operations And - 1) combine, 2) shared attributes, 3) represents decimal point when a number is in words Angle - two line segments that meet at a point Area - the size of a two-dimensional figure in square units Array - a rectangular arrangement of objects with equal amounts in each row Attribute - a characteristic of a shape or set of data Average - a number that best describes a set of data Axis - one of the reference lines on a coordinate graph B Balance - 1) a scale uses to figure out approximate weight, or 2) to be equal or to make equal Bar Graph - a way of organizing data in horizontal or vertical bars Base - the face on which a three-dimensional object sits Beneath - in a lower place Between - in a position that separates two other things Bi - prefix meaning two Borrowing - see subtraction C Calculate - to perform a mathematical operation (+, -, x, divide sign) Calendar - a tool to keep track of the date Cartesian plane - coordinate grid Center - middle point Centimeter - a metric measure which takes 10 millimeters to make Century - 100 years Circle - a perfectly round shape that has all points equally as far from the center Circumference - the perimeter of a circle Coins - metal money Clockwise - turning in the direction a clock turns - to the right Column - a vertical list Commutative Property - the sum or product stays the same when the order of addends/factors changes Composite Number - a number that has more than two factors Compute - to figure out an answer Cone - a three-dimensional shape with a circle base and one vertex Congruent - having exactly the same shape and size Coordinates - an or