This is how to decode any Manhattan address

These days, New Yorkers need only to whip out their phones to figure out the cross street for any Manhattan address.

But in the pre-Google Maps era, city residents had another way of deciphering cross streets. Not to scare you, but it involves a little math.

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This guide, the size of a business card, sums up the formulas, which varied depending on what street address you wanted to decode.

Ephemeral reader Rich L. found this old-school gem while going through old papers and thinks it was printed in the 1960s. Try it, it really works!