The trick in units conversions is to keep multiplying by one at each step. Just make your "1" special by putting the target units in the numerator and the existing units in the denominator, and cancel units that show up in both the numerator and denominator of the product. Like if you want to convert 175kg to g,
175kg * (1000g/1kg) = etc.
Or if you want to convert hours^2 to seconds^2,
1hour^2 * (3600seconds/hour)^2 = etc.
Does that make sense?