I am a foreign student preparing for UK exams in maths and am confused by number formats I should use.
(1) While studying the US, my teacher sometimes considered my number $1$ to be $7$ as I wrote a diagonal line, which is not normally used in the US (see the image). How are these digits, as well as $4$, normally written in the UK?
(2) In my language, we never say and in long numbers, which is opposite in English. If $1,234,567$ is pronounced as 'one million, two hundred and thirty-four thousand, five hundred and sixty-seven' (i.e. 'and' is not used between units and thousands, thousands and millions, etc.), how to pronounce long numbers containing zeros correctly, e.g.:
- $12,005$ = twelve thousand (and?) five
- $12,050$ = twelve thousand (and?) fifty
- $12,500$ = twelve thousand (and?) five hundred.
(3) Is it the correct notation for recurring decimals in the UK?
$1.22345634563456... = 1.22$$\dot3$$45$$\dot6$
How is this number normally pronounced, 'one point two two (and?) three four five six repeating / repeated / recurring / recurred / into infinity'?