+ - addition operation symbol, - - subtraction operation symbol, x - multiplication operation symbol, ÷ - division operation symbol, sum - the answer to an addition problem, difference - the answer to a subtraction problem, product - the answer to a multiplication problem, quotient - the answer to a division problem, decimal - numeral system with ten as its base identified by a decimal separator, estimate - an educated guess using rounding in the operation, place value - the numerical value that a digit has based on its position in the number, zero property - any number multiplied by zero is zero, identity property - any number multiplied by one is that same number, commutative property - the order of the factors doesn't change the product, associative property - the groups of the factors doesn't change the product,

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