587 x 999 = ?

Question:
587 x 999 = ?

[A].

586413

[B].

587523

[C].

614823

[D].

615173

Answer: Option A

Explanation:

587 x 999	= 587 x (1000 – 1)
	= 587 x 1000 – 587 x 1
	= 587000 – 587
	= 586413.