sum - the answer to an addition problem, addition - the act of calculating the total of 2 or more numbers, subtraction - the act of taking away one number from another, less - The symbol < means ' is __________ than', negative - Numbers less than zero are called ____________ numbers, guesstimate - A very good guess or rough calculation of an answer., Descending - Numbers that are decreasing from largest to smallest are in __________ order, product - The answer to a multiplication question, quotient - The answer to a division problem, pentagon - A polygon with five sides and five angles., straight angles - An angle whose measure is 180 degrees., intersecting - Lines that cross each other at exactly one point____________lines, octagon - A polygon with eight sides and eight angles,

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