I do not use commas.
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Use comma in a writing. Procedurel Text, Recounts Or others.
use a caculator and ask your teacher what expanded form is? aha , but number form it is, 4.4721359 OR its longer then that :}
:D
The use of a comma before the 'and' in a list should generally be avoided. Its use is acceptable when it assists in the meaning of a sentence, especially where one of the items in the list is already joined by 'and' (they had a choice between croissants, bacon and eggs, and muesli).
Generally, we use expanded form when numbers have more than one digit to show how they're constructed. 0.6 has only one digit, so expanded form doesn't really apply.