Для вычисления нам нужна одна целая пять тысячных.

Questions & Answers about Для вычисления нам нужна одна целая пять тысячных.

Why do we use the feminine form одна целая for a number?
Decimal fractions in Russian implicitly refer to the feminine noun часть (part) or доля (fraction). Because of this hidden noun, the integer part is always feminine. We say одна целая meaning 'one whole (part)'.
Why is тысячных in the Genitive plural?
Just like regular nouns, fractional parts follow the case rules for numbers. The number пять requires the following word to be in the Genitive plural. The word for 'thousandth' is тысячная (a feminine adjective acting as a noun), and its Genitive plural form is тысячных.
Why does the sentence use the feminine нужна instead of the neuter нужно?
The concept of 'need' is expressed here with the short adjective нужен, which must agree in gender and number with the grammatical subject. The subject being needed is the fraction starting with одна целая, which is feminine singular, so we use нужна.
Could I just say the Russian word for comma (запятая) to read this as 'one comma zero zero five'?
In very casual dictation, you might hear Russians say something like один, запятая, ноль ноль пять (note that Russian uses a comma instead of a decimal point). However, reading the fraction out fully using целая and тысячных is the standard, grammatically correct way you are expected to use at this level.

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