Question

I can't figure out how to line up 75.2 x 3.55

Answer 1

75.2
*3.55
---------
266.96

First ignore the decimal points, and solve as if they weren't there.
After solving put the decimal point; The decimal point will have as many places as both #s combined.

Answer 2

75.2
* 3.55
That is how you align those numbers