Question 117898
1.
Multiplication of a {{{positive}}} number by a {{{positive}}} number yields a {{{positive}}}{{{ result}}}; for example, {{{2 * 3 = 6}}}
2.
Multiplication of a {{{ positive }}} number by a {{{ negative }}} number yields a {{{negative}}}{{{ result}}}; for example, {{{2*(-3) = -6}}}

3.
Multiplication of a {{{negative}}} number by a {{{positive}}} number yields a {{{negative}}}{{{ result}}}; for example, {{{(-2) * 3 = -6}}}

4.
Multiplication of a {{{negative}}} number by a {{{ negative }}} number yields a {{{ positive }}}{{{ result}}}; for example, {{{(-2) *(-3)= 6}}}

Or, we can use only sign to write these rules:

1.(+)*(+)=(+)	
2. (+)*(-)=(-)
3. (-)*(+)=(-)
4. (-)*(-)=(+)



Multiply  {{{(10)(6)(-9)= 60(-9)= -540}}}