Talking about pure numbers, we can also use plurals: 'the total is somewhere in the two thousands' = it's somewhere between 2000 and 2999, but I'm not sure where. We talk about 'the low two thousands' (2000 to perhaps about 2300) and 'the low thousands' (somewhere over 1000 to about 3000, but not a larger number of thousands). More @Wikipedia
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