Question 978507
This is a unit conversion problem.


Given: 6.5 x 10^8 metric tons


Abbreviations for units:
KG = kilogram
MT = metric ton


Conversion factor:  1000 KG/1 MT



Multiply by the conversion factor to go from MT to KG



(6.5 x 10^8 MT) * (1000 KG/1 MT) = (6.5 x 10^8)*(1 x 10^3) = 6.5 x 10^11 KG


Notice how the MT units cancel


So, 6.5 x 10^8 MT = 6.5 x 10^11 KG


-------------------------------------------------------

Now use the fact that "A grain of wheat weighs about .000008 kilograms." to do another conversion


Conversion factor:  1 grain/0.000008 KG



Multiply by the conversion factor to go from KG to number of grains



(6.5 x 10^11 KG)*(1 grain/0.000008 KG)
(6.5 x 10^11 KG)*(1 grain/8*10^(-6) KG)
(6.5/8) x (10^11/10^(-6)) grains
(0.8125) x 10^(11-(-6)) grains
(0.8125) x 10^(11+6) grains
(8.125 x 10^(-1)) x 10^(17) grains
8.125 x 10^(-1+17) grains
8.125 x 10^(16) grains


The answer in scientific notation is <font color="red">8.125 x 10^(16) grains</font> of wheat


Expand that all out, to write into standard form, to get <font color="red">81,250,000,000,000,000 grains</font> (8125 followed by 13 zeros) of wheat


Note: In words, that large number above is <font color="red">eighty-one quadrillion, two hundred fifty trillion</font>