To find the area of the Canadian football field, we need to add the additional area to the American football field.
The additional area of the Canadian football field is 3,350 square yards.
So, the total area of the Canadian football field is:
6.4x10^3 + 3,350 = 6.4x10^3 + 3.35x10^3 = 9.75x10^3 square yards.
Therefore, the area of the Canadian football field is 9.75x10^3 square yards in scientific notation to 2 decimal places.