Convert £0.91 to UK Decimal Currency - Help Needed

  • Context: MHB 
  • Thread starter Thread starter Hobo5
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Discussion Overview

The discussion revolves around converting the UK decimal currency amount of £0.91 into the pre-decimal currency system of pounds, shillings, and pence (£ s d). The scope includes mathematical reasoning and historical context regarding currency conversion.

Discussion Character

  • Mathematical reasoning, Historical, Debate/contested

Main Points Raised

  • One participant requests assistance in converting £0.91 to the pre-decimal currency format.
  • Another participant explains the conversion process, detailing the relationship between old pence, shillings, and pounds, and provides a calculation that results in £0.91 being equivalent to £0 18s 2.4d.
  • Some participants suggest that eliminating smaller denominations, like the penny, could simplify currency systems, referencing practices in Canada and Europe.
  • A later reply humorously questions the clarity of currency conversion by comparing it to the lack of clarity in knowing how many dollars are in a dollar.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and practicality of maintaining smaller currency denominations, with some advocating for their elimination while others focus on the conversion process itself. The discussion remains unresolved regarding the best approach to currency simplification.

Contextual Notes

The conversion calculations depend on historical definitions of currency and may not account for all nuances of pre-decimal currency usage.

Hobo5
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Sir,
Would anyone be able to help me with converting the UK decimal currency amount of £0.91 to £ s d
Thank you in advance,
Regards,
P.N.
 
Mathematics news on Phys.org
In the pre-decimal currency of the UK, there were 12 old pence in one shilling and 20 shillings in one pound; thus there were 240 old pence in a pound. (Note that the symbol for the old (pre-decimal) penny is d whereas p is the symbol for the new (decimal) penny.)

If $x$ is the amount of old pence corresponding to 91 new pence, then
$$\frac x{240}\ =\ \frac{91}{100}$$
giving $x=0.91\times240=218.4$.

$218.4\ =\ 18\times20+2.4.$

Hence $£0.91\ \text{(decimal)}\ =\ £\mathrm{0\,\,18\,s\,\,2.4\,d}\ \text{(pre-decimal)}$.
 
EASIER if you do what we did here in Canada:
eliminate the **** penny!
 
Wilmer said:
EASIER if you do what we did here in Canada:
eliminate the **** penny!

Don't you have the problem that you don't know how many dollars there are in a dollar?
Easier if you do what we did here in Europe: only one Euro. :p
 

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