To find the area of the Canadian football field, we need to add 3,350 square yards to the area of the American football field.
Area of Canadian football field = Area of American football field + 3,350 square yards
= 6.4×10^3 + 3,350
Now, we need to convert the sum into scientific notation.
= 0.64×10^4 + 3.35×10^3
= 0.64×10^4 + 0.335×10^4
= (0.64 + 0.335)×10^4
= 0.975×10^4
Therefore, the area of the Canadian football field is 0.975×10^4 square yards.