To find which number is one thousand times larger than 2.3 x 10^2, you would do the following steps.
a
Change 1,000 to Scientific notation and then add to (2.3 x 10^2)
b
Change 1,000 to Scientific notation and then multiply by (2.3 x 10^6)
c
Change 1,000 to Scientific notation and then divide by (2.3 x 10^6)
d
Change 1,000 to Scientific notation and then subtract from (2.3 x 10^6)
10^3 * 2.3 * 10^2
= 2.3 *10^5
which is none of the above