I guess they were referring to how a third of a yard would be a foot or 12 inches and that most people have an intuitive understanding of such common lengths. Also, because of the factors involved, “simple” fractions (e.g. ½, 1/3, ¼, ...) often end up at integral lengths.
But intuitive understanding of certain lengths is certainly not limited to the Imperial system. I frequently use A4 paper for measuring if I don't have a ruler at hand. I know the span between the tip of my thumb and pinky is pretty much 21 cm and so on. 8.2 inches probably wouldn't be much handier either.
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Like, 100/3 = 33 cm? That's supposed to be difficult?
Or do you mean that it's difficult to know how to draw a third of a meter?
Why, is drawing a line that's one meter, or one yard, or one foot any easier?
Without a measure I can't draw accurately any of them.
I guess they were referring to how a third of a yard would be a foot or 12 inches and that most people have an intuitive understanding of such common lengths. Also, because of the factors involved, “simple” fractions (e.g. ½, 1/3, ¼, ...) often end up at integral lengths.
But intuitive understanding of certain lengths is certainly not limited to the Imperial system. I frequently use A4 paper for measuring if I don't have a ruler at hand. I know the span between the tip of my thumb and pinky is pretty much 21 cm and so on. 8.2 inches probably wouldn't be much handier either.