My Dad was a high school electricity teacher and he taught us a little mnemonic or verse to help us remember Ohm's Law:
The Indian on the mountain watched the vulture chase the rabbit which can be written as:
I = V / R (resistance in ohms = voltage divided by current in amperes)
or
V = I x R (voltage = current in amperes multiplied by resistance in ohms)
or
R = V / I (resistance in ohms = voltage divided by current in amperes)
Pete
In ET"A" school, I learned this one:
Cover the one you're solving for, the formula is what remains.
That is, if you're solving for R cover that and what you see is E over I or E/I