Hello everybody!
I'd like to ask at the"s" of "thousand".Could anyone tell me why there is an"s"? I haven't seen this usage before.And many English tutors I have asked can't tell too.
So I'm waiting for your help.Thanks a million.🌹[Image]

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It is the place value I believe.  I think it would be clear if the y-axis values started at 10.  I would make sense.  10,000, 30,000, 50,000 and so on.

It has an -s because of place value.  Ones, tens, hundreds, thousands...

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[Image]

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Thousands is the plural of thousand.

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It shows that each value on the vertical scale is going to multiply with ten thousand (10000). For-example 280*10000=2800000 participants.

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It is numbered in ten thousands, and thousand is a noun, so gets an "s".  So, in 2012, there were 50 x 10,000=500,000. If it said "ten thousand participants", the "s" would have to be on "participants".