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I don't think it's typically necessary. I think the book did so to drill home the point that in one structure 2 carbons are single bonded and 2 are double bonded and then it is flipped in the second. I know they also number carbons when drawing glucose so it might be more common in larger, repetitive structures especially in organic chemistry examples.
No, it is not necessary to label the atoms numerically in resonance structures. It was just used in the manual to emphasis the fact that resonance spreads multi-bond character across the overall compound.
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