Question

Starting from $(-1)\times 5,$ write various products showing some pattern to show $(-1)\times (-1)=1$.

Answer 1

According to the pattern,

$(-1)\times \left(5\right)=-5$

$(-1)\times \left(4\right)=-4$

$(-1)\times \left(3\right)=-3$

$(-1)\times \left(2\right)=-2$

$(-1)\times \left(1\right)=-1$

$(-1)\times \left(0\right)=0$

$(-1)\times (-1)=1$

Hence, this is the answer.