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If you study trigonometry you learn the definitions of the trigonometric functions by means of the acronym SOH CAH TOA which stands for sine: opposite over hypotenuse; cosine: adjacent over hypotenuse; tangent: opposite over adjacent. This is a very useful acronym.
After the fall of the Roman empire, the rest of Europe took over their letters and when they started discovering the rest of the world, they took their writing with them. Also it's a lot easier to learn than most Asian and other native writings, since it only has 26 letters.
Just use ordinary letters in their capital letter form-e.g. 10=X50=L500=D437=CDXXXVIIIt takes some practice to learn the numbers though!
An antonym of the word learn is the word misunderstand.
Just learn them.