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I used imperial units in this tutorial because that happened to be the doorstop dimensions I found online. You can still follow along with millimeters if that's what you prefer....

👉 Learn how to add or subtract two functions. Given two functions, say f(x) and g(x), to add (f+g)(x) or f(x) + g(x) or to subtract (f - g)(x) or f(x) - g(x) the two functions we use the method of adding/subtracting algebraic expressions...

This nugget teaches to understand the concept of a fraction as parts of a whole and to identify the numerator and denominator of a fraction.