278000 written in scientific notation would be 2.78×10⁵.
You can convert the number into scientific notation by doing the following:
1. Turn 278000 into 2.78000.
2. Move the decimal point to the end of the number, so that it becomes 278000 again.
3. Count the number of places that the decimal point was moved.
Since the decimal point was moved 5 places to the right, the exponent on the 10 will be positive five. Therefore, 278000 becomes 2.78×10⁵.