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square A rectangle whose sides are all the same length.

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square array A rectangular array with the same number of rows as columns.

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square number A number that is the product of a whole number multiplied by itself; a whole number to the second power. 1 4 9 16 35 = 35 x 35 = 1225 2

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square of a number The product of number and itself.

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square pyramid A pyramid with a square base.

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square root of a number The square root of a number n is a number which, when multiplied by itself, results in the number n. 320= 2*2*2*2*2*2*5 320= 4*4*4*5 or 320=16*4*5 √320=8√5

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square units The units used to measure area. 7 square units

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standard notation The most familiar way of representing whole numbers, integers, and decimals by writing digits in specified place. 587 = 500 + 60 + 7 expanded notation standard notation

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standard unit A uniform unit of measure.

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step graph A graph that looks like steps.

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stem-and-leaf plot A display of data in which digits with larger place values are named as stems, and digits with smaller place values are names as leaves.

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s traightedge A tool used to draw a line segment.

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subtraction A math operation based on taking away one quantity from another or decreasing quantity. 7 - 3 4 minuend subtrahend difference

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subtrahend The number being subtracted. 7 - 3 4 minuend subtrahend difference

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sum The answer to an adding problem. addends 14 + 15 + 6 = 35 sum

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supplementary angels Two angels whose measures total 180. o

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survey Collection data for graphing and analysis.

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symmetry The property of exact balance in a figure; having the same size and shape across a dividing line.

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symmetry The matching of two halves of a shape.

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tally marks Marks used to keep track of a count. 5 10 11

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tally chart Tally charts are used to organize and display data. A tally chart is a table that shows how many times each value appears.

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tangent Intersecting at exactly one point.

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template A pattern used as a guide in making something accurately.

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tens The place-value position equal to ten times the unit value. 5959 270270

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term In an algebraic expression or equation, a number or a product of a number and one or more variables.

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terminating decimal Decimals that continue a pattern without end.. 333… 1313 =. 30

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tessellation An arrangement of closed shapes that covers a surface completely without overlaps or gaps.

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tetrahedron A polyhedron with four faces.

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theorem A mathematical statement that can be proven to be true (or sometimes, a statement that is proposed and needs to be proven).

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3-dimensional (3-D) Objects with thickness,length and width.

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3-dimensional (3-D) Objects that are not completely within a single flat surface.

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tile A shape used in a tessellation. If only one shape is repeated in a tessellation, the tessellation is called a same-tile tessellation.

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tiling An arrangement of closed shapes that covers a surface completely without overlaps or gaps.

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time line A number line showing years, days,and events in a sequence.

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tool kit A bag containing things needed in math.

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top-heavy fraction A fraction that names a number greater than or equal to 1; a fraction whose numerator is equal to or greater than its denominator.

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trade-first subtraction Subtraction procedure in which all necessary trades are done before any subtractions are carried out.

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trapezoid A quadrilateral that has one pair of parallel sides. No two sides need to be the same length.

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translation The motion of “sliding” an object or picture along a straight line.

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transparent mirror A mirror with a front and back face that has a recessed edge used for drawing lines of symmetry.

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triangle A 3-sided polygon.

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triangular prism A prism whose bases are triangles.

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triangular pyramid A pyramid whose bases (faces) are triangles.

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trillion A digit(s) followed by 12 whole-number places. One trillion written in number form is 1,000,000,000,000 in exponential form 10 12

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triple Three times an amount.

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turn Rotation.

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turn-around facts A pair of add or multiplication facts in which the order of the addends or the factors is reversed. 6 + 3 3 + 6 143 + 23 23 + 143 2 x 3 3 x 2 234 x 5 5 x 234

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twin primes Two prime numbers that are separated by just one composite number. 3 and 5 are twin primes, because they are separated by the composite number 4.

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2-dimensional (2-D) Objects completely within a flat surface; objects with length and width, but no thickness.

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unit A label, descriptive word, or unit of measure used to put a number in context. 24 children 27 ducks 30 cents 3 o’clock 1 kg

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unit ONE of something,

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unit box A box displayed alongside a set of numbers or problems. Unit cents dogs days inches bats

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unit fraction A fraction that names one of the equal parts of the whole. The numerator is always 1.

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unit marks The equidistant makes that represent numbers on thermometers, rulers, and other scales of measurement.

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U.S. customary system The standard measuring system used in the United States. Distance inch foot yard mile Capacity cup pint quart gallon Weight ounce pound Temperature Fahrenheit

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variable A letter other symbol that represents a number. A variable need not represent one specific number; it can stand for many different values.

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vertex (vertices) The point at which the rays or line segments of an angle, sides of a polygon, or the ends of a polyhedron meet.

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vertical angles Two intersecting lines form four angles. Two angles with the same vertex, but no sides in common.

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volume The measure of the amount of space a 3- dimensional shape takes up.

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weight A measure of how heavy something is.

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“What’s My Rule?” A routine that involves a set of number pairs in with the numbers in each pair are related to each other according to the same rule.

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whole The entire object, collection of objects, or quantity being considered; the ONE, the unit, 100%.

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whole number Any of the numbers.

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Whole number Any of the numbers. 1, 2, 3, 4, …

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width of a rectangle Length of one side of a rectangle or rectangular object; often the shorter side.

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X-by-y array An arrangement having x rows of y per row, representing x set of y objects in each set. 2-by-6 arrays: 2 rows, 6 per row Array of Dots Array of squares

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yard (yd) Standard unit of length equal to 3 feet or 36 inches. 1 23

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zero facts The sum of two 1-digit numbers where one of the addends is zero. The product of two 1 digit numbers. The produce is always 0. 0 + 5 = 54 x 0 = 0 8 + 0 = 80 x 8 = 0 0 + 6 = 67 x 0 = 0

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zone A group of locations, usually determined by distances, for which a uniform rate is charged by a delivery or transportation system.

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