MemoryMentor’s Blog

If you need to learn a formula, and need to rearrange it, the easiest way is just to learn one part of it and use a cross to find out the others. For example, I’ve put an image of the mass = moles * Mr .

Then because mass is on the top of a multiplication sign, to get mass it’s moles * Mr and to get moles it’s mass / Mr (because the line looks like a fraction.