 | | | Subject: Mental arithmetic
Posted Aug 10, 2007 by Vestboy back in the UK
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1
 | | Being schooled in £sd I wanted to say something in its favour. We used to, and still do, purchase items in dozens - eggs for example.
Maths Problem 1: Mary buys a dozen eggs at 7d each. How much does she pay?
Answer: 7/- (seven shillings - no multiplication tables required)
It was easy to use pennies to buy dozens of items as it converted straight to shillings.
In weight in the UK we had/have hundredweights (cwt) which were 20ths of a ton. A hundredweight was 10 stones or 140 lbs (Look there's that libra meaning pound again!)
Maths Problem 2: A coal merchant sells coal at 14/- per cwt. How much would you pay for a ton?
Answer: £14 (Yes, when you were buying in 20s (scores) you could convert shillings straight into pounds).
On decimalisation there was a clever little trick that we were taught for converting new prices into old prices for a rough guide. Take the new pence figure, double it and put a slash before the last digit. So 13p > 26 > 2/6 "Two and sixpence" (the accurate figure was that 2/6 was worth 12.5 new pence but as I said this was a rough guide.
44p > 88 > 8/8 Eight and eightpence (closer to eight and tenpence really but you get my drift)
55p > 110 > 11/- Eleven shillings - Bang on!
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| | | Subject: Mental arithmetic
Posted May 9, 2009 by simon bolivar
This is a reply to this Posting
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4
 | | Apropos arithmetic feats, I recall a barman in Manchester in the mid- 1980's who would price up every round of drinks in pounds, shilling and pence and loudly advise one's change in the same way.
I should add that, after say 4 pints of Boddingtons, no-one in my rabble of drinking mates could be bothered to check his calculations, but it was a good party-piece, nonetheless.
The pub (Tommy Ducks ?) and the barman, sadly long gone...
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