duck soup

If you describe your math test as duck soup, you mean that it was incredibly easy.

There are a lot of figurative ways to say something's simple besides duck soup: easy as pie, piece of cake, and a breeze are just a few. Less easy is figuring out exactly where duck soup came from. It seems to have appeared in the early 1900's in a series of newspaper cartoons, but experts wonder about its origins — and how making duck soup could possibly be considered as easy as falling off a log.

Definitions of duck soup
1

n any undertaking that is easy to do

Synonyms:
breeze, child's play, cinch, picnic, piece of cake, pushover, snap, walkover
Types:
doddle
an easy task
Type of:
labor, project, task, undertaking
any piece of work that is undertaken or attempted

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