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vocabulary puzzle

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Across
5
the values of two mathematical expressions are equal
6
you multiply a sum by multiplying each addend separately and then add the products.
7
changing the order of addends does not change the sum.
8
when you multiply any number by its opposite, the result is always 1.
Down
1
a letter such as a, b or c to stand for a fixed number.
2
the equations that have the same solution.
3
the values of two mathematical expressions are equal
4
you can add or multiply regardless of how the numbers are grouped.