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Ratio -
The relation between two quantities. Ratios can be expressed in fractions, decimals, percents or words. When your favorite baseball teams whens 4 games out of 5, the ratio is 4:5 or four out of five or 4/5.
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Ray -
A straight line with one endpoint. In the direction away from the endpoint, the line extends to infinity.
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Range -
The difference between the maximum and the minimum values in a set of data.
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Rectangle -
A parallelogram or four sided geometric shape that has four right angles (90 degree angles).
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Repeating Decimal -
A decimal with endlessly repeating digits. 5 divided by 3 will give a 1.6666666666666 forever.
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Remainder -
The number that is left over when a numerator cannot be divided evenly by the denominator. 5 divided by 3 leaves a remainder of 2.
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Right Angle -
An angle that measures exactly 90 degrees.
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Right Triangle -
A triangle with a right angle.
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Roman numeral -
A counting system using letters to represent numbers, where I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.
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