Multiplying Integers
Multiply.
(80)(90)=\displaystyle {\left({80}\right)}{\left({90}\right)}= (30)(60)=\displaystyle {\left(-{30}\right)}{\left(-{60}\right)}=
(60)(130)=\displaystyle {\left({60}\right)}{\left(-{130}\right)}= (20)(80)=\displaystyle {\left(-{20}\right)}{\left({80}\right)}=