Question on: WAEC Mathematics - 2010
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
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Correct Option: D
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
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