Meant to say that I buy potatoes by the half hundred weight (well I did, they must be metric now), but we used to have coal delivered in hundredweight sacks.
Please overlook the spelling mistakes above (I did)

More confusing are the weights and measures in handed down recipes.
I have OH's grandmother Christmas pudding recipe, so every year we ponder 'is this a small carrot?' 'how big should the orange be?' the apple is OK, quarter pound, I can do that. Then the tablespoon of baking powder, quite apart from wondering level / rounded / heaped I looked in my cook book "1 tablespoon = 4 teaspoons", then I found a plastic measuring spoon, one end 5ml = 1 teaspoon, the other 15ml = 1 tablespoon. Ah well.
By the time it's been soaked in rum and set fire to no-one will notice anyway. Its not something I make regularly enough to standardise in my own way. (My scone recipe includes... water till it feels right...cook till done)