London (England) uses the British pound as its currency. While exchange rates vary daily, at the time of this answer, $1 US equals 0.692 pounds.
im not sure what 'their' you are talking about, but generally, US currency is less valuable.
More stable than the US dollar.
.80 for each dollar US. So more than a US Dollar.
Residents in the Caribbean save in US dollars because it is more stable than their currency. When they save in US dollars, they know that the dollar will be more inclined to hold its value.
Currency trading is buying foreign currency and converting it to your currency. Foreign currency when converted to US currency is worth more than the American dollar. In order to do this you need to know the exchange rates.
About 10 cents. The us money is worth less than our currency
The value of UK money compared to US currency fluctuates based on exchange rates. Generally, the British pound is stronger than the US dollar, meaning that 1 British pound is worth more than 1 US dollar.
The US dollar
There are lots of countries where the US dollar buys much more than in the US, however you have to live there to get the benefit.
Africa is a continent with more than 50 countries. So there are many different currencies in Africa to compare against the American dollar.
You cannot bring more than the equivalent of USD 10,000. This means you cannot bring more than MXN 130,715.53 with yourself.
2nd just below Great Britain which means that it is worth more than most of the worlds currencies and you will get more of the foreign currency for your US$.