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6th Grade Math Vocabulary Words for the 1st Nine Weeks Unit 1 Operations with Positive Fractions & Decimals (15days) Positive rational numbers – the set of numbers that can be expressed as a fraction , where a > 0 and b > 0 Reciprocal – a quantity that is used to multiply by a given quantity which results in the product of one Unit 2 Geometry & Measurement (9 days) Acute – an angle that measures less than 90° Angle – two rays with a common endpoint (the vertex) Angle congruency marks – angle marks indicating angles of the same measure Area – the measurement attribute that describes the number of square units a figure or region covers Base of a rectangular prism – any two congruent, opposite and parallel faces shaped like rectangles; possibly more than one set Congruent – of equal measure, having exactly the same size and same shape Equation – a mathematical statement composed of algebraic and/or numeric expressions set equal to each other Face – a flat surface of a three-dimensional figure Height of a rectangular prism – the length of a side that is perpendicular to both bases Obtuse – an angle that measures greater than 90° but less than 180° Polygon – a closed figure with at least 3 sides, where all sides are straight (no curves) Positive rational numbers – the set of numbers that can be expressed as a fraction , where a > 0 and b > 0 Prism – a three-dimensional figure containing two congruent and parallel faces that are polygons Properties of triangles – relationship of attributes within a triangle (e.g., an equilateral triangle has all sides and angles congruent, the sum of the lengths of two sides of a triangle is always greater than the length of the third side, the sum of the angles of a triangle is always 180°; etc.) Right Angle – an angle (formed by perpendicular lines) that measures exactly 90° Three-dimensional figure – a figure that has measurements including length, width (depth), and height Triangle – a polygon with three sides and three vertices Two-dimensional figure – a figure with two basic units of measure, usually length and width Unit rate – a ratio between two different units where one of the terms is 1 Volume – the measurement attribute of the amount of space occupied by matter Unit 3 Operations with Integers (12 days) Absolute value – the distance of a value from zero on a number line Integers – the set of counting (natural numbers), their opposites, and zero {–n, …, –3, –2, –1, 0, 1, 2, 3, ..., n}. The set of integers is denoted by the symbol Z. Unit 4 Equivalent forms of Fractions (12 days) Percent – a part of a whole expressed in hundredths Positive rational numbers – the set of numbers that can be expressed as a fraction , where a > 0 and b ≠ 0