Solve using properties of multiplication-

  1. 886X(-99)+(-886)
  2. (-16)X(-18)+(-4)X(-18)

1)886 (-99) + (-886)

 886(-100+1) + (-886)

 -886 *100 +886 -886

  88600 ans

2)(-16)*(-18) + (-4)*(-18)

By property,

 -18(-16+(-4))

 -18(-16-4)

 -18(-20)

360 ans

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