Question 109605
65 million=6.5 x 10^7 and 19.5 billion=1.95 x 10^10



So 65 million/19.5 billion is 


{{{6.5*10^7/(1.95*10^10)}}}


Now divide 6.5 by 1.95 to get {{{6.5/1.95=3.3}}} (which is rounded off)


Now subtract 7 from 10 to get {{{7-10=-3}}}



So our answer is 3.3 x 10^-3