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What is 1 + 3?
a number that multiplies a variable
a mathematical phrase with an equal sign
a mathematical phrase without an equal sign
less than or equal to
greater than or equal to
can add or multiply in any order and still get the same answer
you add or multiply in the same order but change the ( )
a letter that represents a number
addition property of zero
8+0=0 when a # is added to 0 the sum is always the other # added to 0
addition property of -1
any number times -1 is the same number but the opposite (+-)