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**A rectangle whose sides are all the same length.**

square A rectangle whose sides are all the same length.

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

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

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

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**The product of number and itself.**

square of a number The product of number and itself.

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**A pyramid with a square base.**

square pyramid A pyramid with a square base.

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**square root of a number 320= 2*2*2*2*2*2*5 320= 4*4*4*5 or 320=16*4*5**

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

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**The units used to measure area.**

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

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**standard notation 587 = 500 + 60 + 7 standard notation**

expanded notation standard notation The most familiar way of representing whole numbers, integers, and decimals by writing digits in specified place.

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**A uniform unit of measure.**

standard unit A uniform unit of measure.

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**A graph that looks like steps.**

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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**A tool used to draw a line segment.**

straightedge A tool used to draw a line segment.

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

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**The number being subtracted.**

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

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**The answer to an adding problem.**

sum addends sum = 35 The answer to an adding problem.

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**Two angels whose measures total 180 .**

supplementary angels Two angels whose measures total 180 . o

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**Collection data for graphing and analysis.**

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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**The matching of two halves of a shape.**

symmetry The matching of two halves of a shape.

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**Marks used to keep track of a count.**

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

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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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**Intersecting at exactly one point.**

tangent Intersecting at exactly one point.

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

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

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**The place-value position equal to ten times the unit value.**

tens 59 270 The place-value position equal to ten times the unit value.

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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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**Decimals that continue a pattern without end.**

terminating decimal .333… 1 3 = .30 Decimals that continue a pattern without end.

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

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**A polyhedron with four faces.**

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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**Objects with thickness,length and width.**

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

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**Objects that are not completely within a single flat surface.**

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

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

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**A bag containing things needed in math.**

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

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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**A prism whose bases are triangles.**

triangular prism A prism whose bases are triangles.

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

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

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**A digit(s) followed by 12 whole-number places.**

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

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triple Three times an amount.

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turn Rotation.

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

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**Two prime numbers that are separated by just one composite number.**

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

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

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unit ONE of something,

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**A box displayed alongside a set of numbers or problems.**

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

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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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**The standard measuring system used in the United States.**

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

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

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

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**A measure of how heavy something is.**

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 1, 2, 3, 4, … Any of the numbers.

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

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**Standard unit of length equal to 3 feet or 36 inches.**

yard (yd) 1 2 3 Standard unit of length equal to 3 feet or 36 inches.

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**zero facts 0 + 5 = 5 4 x 0 = 0 8 + 0 = 8 0 x 8 = 0 0 + 6 = 6 7 x 0 = 0**

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.

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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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