The answer is 900 because 20×9=180 and just multiply 180×5 and that equals 900.
The property used is Commutative property. ;
The product of 20 × 9 × 5 is 900 . The property used in this calculation is the Commutative Property of multiplication, which allows us to rearrange the order of multiplication. We first multiplied 20 by 5 , resulting in 100 , and then multiplied that by 9 to get 900 .
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