Numbers - General Aptitude

Q1:

587 x 999 = ?

A 586413

B 587523

C 614823

D 615173

ANS:A - 586413

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