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, we move it 7 places to the left, giving us 1.24.
2. Count the number of places you moved the decimal. This number becomes the exponent of 10.
3. Write the number in the form a x 10b, where 'a' is the number between 1 and 10, and 'b' is the exponent.
