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vocabulary puzzle

Across
the values of two mathematical expressions are equal
you multiply a sum by multiplying each addend separately and then add the products.
changing the order of addends does not change the sum.
when you multiply any number by its opposite, the result is always 1.
Down
a letter such as a, b or c to stand for a fixed number.
the equations that have the same solution.
the values of two mathematical expressions are equal
you can add or multiply regardless of how the numbers are grouped.