Этот тариф на десять рублей дешевле.

Questions & Answers about Этот тариф на десять рублей дешевле.

Why do we use на in this sentence instead of just putting the amount before the comparative?
In Russian, to express the exact difference in a comparison (how much more or less something is), you must use the preposition на followed by the Accusative case. You can think of it as meaning cheaper BY ten rubles.
If на requires the Accusative case, why is рублей in the Genitive plural?
The preposition на only dictates the case of the numeral directly following it. So, the number десять is in the Accusative case, which looks identical to the Nominative here. The word рублей is simply following the standard number rule: quantities of five and above require the noun being counted to be in the Genitive plural.
Is it possible to change the word order and say Этот тариф дешевле на десять рублей?
Absolutely. Both word orders are perfectly natural and grammatically correct. Placing the amount of difference (на десять рублей) before the comparative adjective (дешевле), as in the original sentence, is just a very common stylistic habit in spoken Russian.
What kinds of things does the word тариф usually refer to in everyday Russian?
While it translates to rate or tariff, in modern Russian тариф is most frequently used to talk about mobile phone plans, internet service packages, or taxi fare structures. This sentence is likely someone comparing two different phone or internet subscriptions.

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