Please tell me this isn't so.....

I bought a cubby house kit for  g'daughter for Xmas. Even though local web site, the kit comes from USA. Sorting through all the wooden parts and labelling them so it will assemble easily, I read the book thoroughly. There is a table in the front explaining that the numbers used to refer to  std sizes (nominal) translate to actual sizes that are smaller. I understand this, and know for instance that what we call 4 x 2 isnt really 4" by 2". Its under that due to dressing.

But some of the sizes make me blink....    5/4      ??? What is that ? The last time I saw a fraction like this was in primary school, being taught to write it as either 1.25 or 1-1/4  . Eventually by a process of elimination, it turns out that anything actually 1" thick is called  5/4, because it was originally 1.25"    .. I think?

Is this common in US please?

The other odd part, for a printed manual,  is that all the metric equivalents have the decimal point off by one place....3/4 is given as 1.9mm.

Tks
jp

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