Algebra 1

$156r$
We start with the given expression: $(12\times r)\times13$ The commutative property of multiplication states that changing the order of the factors does not affect the product. We use this property to rearrange the factors: $13\times(12\times r)$ The associative property of multiplication states that changing the grouping of the factors does not affect the product. We use this property to rearrange the grouping: $(13\times12)\times r$ We use the order of operations to simplify: We simplify inside the parentheses: $156\times r$ We multiply: $156r$