Becky says she used the number line recommended by Hung Hsi Wu before teaching common denominators and equivalent fractions to her kids.
I don't know what Wu's fraction number line looks like, whether it's a classic line or a stacked set of lines like the one at the link above.
EAI Education sells the Decimal and Fraction Number line pictured. It looks a little confusing to me, but it may make more sense when you can actually hold it.
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