Simplify 0.000215 x 0.000028 and express your answer in standard form
A
6.03 x 109
B
6.02 x 109
C
6.03 x 10-9
D
6.02 x 10-9
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
0.000215215 x 0.000028
= 215 x 10-4 x 28 x 10-4
= 215 x 28 x 10-6-6
= 6020 x 10-12
= 6.020 x 103 x 10-12
= 6.02 x 103 - 12
= 6.02 x 10-9
Source: Myschool Past Questions Archive (Record #36515)