you can then use simple algebra to solve unit conversion and many other common deductive reasoning questions ("how many miles per gallon...?"), relying on the units to guide you to the solution.
There's probably a name for this, and it is indeed built into the SI notation (km/h vs mph).
1.5 USD = 1.5 * USD
65 mph = 65 * mile / hour
you can then use simple algebra to solve unit conversion and many other common deductive reasoning questions ("how many miles per gallon...?"), relying on the units to guide you to the solution.
There's probably a name for this, and it is indeed built into the SI notation (km/h vs mph).