10
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200 divided by 2 1000 divided by 10 10000 divided by 100 500 divided by 5 OR 400 divided by 4, etc.
d/1000 = 10. multiply both sides by 1000 --> 1000*d/1000 = 1000*10 --> d = 10000 (ten thousand)
1000 plus 10000 equals 11000
10000
There are 2704 of them between 1000 and 10000 inclusive.