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a number that is added in an addition problem. ex. When adding 2 + 3, 2 and 3 are this. 


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The answer to an addition problem 


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A complete sentence that uses numbers and symbols instead of words. ex. 4 + 3 =7 


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an orderly arrangement of numbers determined by following a certain rule, a counting pattern. ex. 10, 20, 30, 40... 


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Counting by ones 1,2,3,4... These numbers continue without end. 


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the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 


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Numbers that indicate position or order ex. First, Second, Third...or 1st, 2nd, 3rd, 4th... 


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the answer to a subtraction problem 


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a group of three numbers that may be arranged to form four facts ex 2+4=6, 4+2=6, 62=4, 64=2 


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It has no end, It just goes on and on in both directions. We draw arrowheads on each end to show this idea. ex<> 


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Part of a line. Has two endpoints, which are sometimes labeled with letters and is named using the letters. 


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The bottom number of a fraction. This number tells the number of equal parts in the whole 


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The top number of a fraction. This number tell how many parts are being counted. 


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A corner formed by two intersecting lines or line segments. 


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Intersecting lines that form "square corners" 


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Lines that go in the same direction and stay the same distance apart 


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a whole number followed by a fraction 


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the distance around a closed flat shape 


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The answer to a multiplication problem. 


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A year that is 365 days long 


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A year that is 366 days long and occurs every 4 years. The extra year occurs in February. 


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the counting numbers, INCLUDING 0.
Ex. 0,1,2,3,4,5,... 


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Closed flat shapes formed by straight lines. 


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The number of squares of a certain size that are needed to cover the shape. 


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The distance from the center to edge of a circle. It is half as long as the diameter. 


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the distance across a circle through the center. It is twice as long as the radius. 

