Here's how to get there:
1. Move the decimal point to the left until you have a number between 1 and 10 (in this case, 5.6).
2. Count how many places you moved the decimal. You moved it three places to the left.
3. Write the number as a product of the new number and 10 raised to the power of the number of places you moved the decimal. This gives you 5.6 x 103.
