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whether you use cash or not in daily life, knowing how to handle pounds/ pence will be crucial as long as people earn salaries in whatever denomination (pounds/ euros/ US Dollars/ etc...). Unless you are incredibly lucky/ well off - most people need to live within their means and therefore need to budget. They need to understand that earn X a month and have to pay Y in rent and A in utility bills and B in transport costs so in terms of spending money they only have D available (D = X-(Y+A+B)).
More than ever understanding that 1 in 5 is the same as 20% or 0.20 is crucial - Facts and figures are flashed at us in the news, at work in the hospital - it is important to be able to decode what is being said in order to make informed decisions.
Often it's about understanding people are giving you percentages of percentages- so just making something up - say you're told 1 in 5 pupils fail to achieve NC L4 in KS2 SATs and of these 80% are on FSM. This kind of stat often ends up being a headline of 80% of primary pupils on FSM fail to achieve NC L4 on KS2 SATs.
AND THAT'S a PROBLEM - that is not what the statistics were saying. Our problem as readers is we don't have the raw data, so can't work out what exactly 80% of 20% of the entire student population in Y6 is exactly - but basically we're talking about ~16% of the total student population. (again stressing I'm totally making up these figures)
Computers - underneath all our fancy APPS/ programmes is maths
Stock market - very clever (?) algorithms are driving the stock market at the moment - especially as more and more stocks are being owned for literally milliseconds and then sold for profit.
Credit - most people at some point or another will have to use credit to buy a large item (a car, a sofa, a house, etc....) - this means that they pay back the money borrowed + interest. Having maths means you can work out whether it is better to wait a bit, save and pay cash up front (which frankly usually is the case) or to pay monthly payments, etc...
Science/ medicine really can't function without maths. With medicine most clinical tests rely on statistically significant results all of which only works with sound maths skills. Hard and soft sciences (so physics to geology) also require maths to record, describe and theorize.
If you run a business - you need to be able to set profit margins/ price points, you need to determine what percentage of profit to reinvest into your business, when you need to raise funds to expand you need to judge whether to do this through banks or 'go public' and release stock in your business, you need to predict capital gains/ tax deductions, you need to calculate sick pay/ holiday pay/ employer's contribution, etc... - all of which require maths (if not of you, of your employee(s)).
As Benjamin Franklin is apparently credited for coining - the only thing in life we can be certain of is death and taxes. At death you have to report the age at death (basic addition/ subtraction skills) - and taxes is also all about addition/ subtraction & percentages.
So - no columngollum - maths will never be irrelevant and an attitude that since you can waive a card around you don't need to understand what you're doing in basic maths terms is, frankly, down right dangerous.
Indeed that's why in the US now many athletes are giving basic financial management training by their employers - too many lost everything to clever accountants/ managers and didn't appreciate things like tax liabilities, etc... e.g. www.nflplayerengagement.com/financial-education/
Finally - have a look at this website - a good maths background built up during your school years can lead to some very exciting & financially rewarding careers: www.mathscareers.org.uk/