Which is the greatest among the given numbers?
(a) $2 \times 0 \times 2006$
(c) $2+0 \times 2006$
(e) $2006 \times 0+0 \times 6$
(b) $2 \times 0+6$
(d) $2 \times(0+6)$
The correct option is (d).

Remember that if one of the factors in a product is zero, then the product is also zero. We have $2 \times 0 \times 2006=0$, $2 \times 0+6=0+6=6$, $2+0 \times 2006=2+0=2$, $2 \times(0+6)=2 \times 6=12$ and $2006 \times 0+0 \times 6=0+0=0$. Therefore, the largest number is $2 \times(0+6)=12$.