13. What is half of $1.6 \times 10^{6}$ ?
A $8 \times 5^{6}$
B $4 \times 10^{6}$
C $8 \times 10^{5}$
D $8 \times 10^{2}$
E $1.6 \times 10^{3}$
13. C Half of $1.6 \times 10^{6}$ equals $0.8 \times 10^{6}=0.8 \times 10 \times 10^{5}=8 \times 10^{5}$.