How do you simplify $90times8!$ ?

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Answer 1 · 2016-12-12T01:15:16

$90xx(8!)=90xx40,320=3,628,800$

$90 xx 8!$

$(8!)=8xx7xx6xx5xx4xx3xx2=40,320$

substituting in:

$90xx40,320=3,628,800$

Answer 2 · 2017-01-29T16:52:45

$90 xx 8! \ = 10 xx 9 xx 8!$
$\ \ \ \ \ \ \ \ \ \ \ \ = 10 xx 9!$
$\ \ \ \ \ \ \ \ \ \ \ \ = 10 xx 362880$
$\ \ \ \ \ \ \ \ \ \ \ \ = 3628800$

How do you simplify 90times8!90times8!?