A. Big numbers should be grouped into sets of three digits from left to right

B. Place value names like 'thousand,' 'million,' and 'billion' are used when reading big numbers

C. In American English, the word 'and' is typically used to connect the hundreds with the tens and ones

D. Numbers are always read in singular form, for example, 'five thousand' and not 'five thousands.'

E. Commas are used to separate the groups of three digits in written English