so you could use numbers like 8.205 8.206 8.207 8.208 8.209 8.211 8.212 8.213 8.214
8.209 8.208 8.207 8.206 8.205
Two different numbers that round to 8.21 when rounded to the nearest hundredth are 8.205 and 8.214. The first rounds up due to a 5 in the thousandths place, while the second rounds down due to a 4. Other numbers, like 8.206 to 8.210, also fit this criteria.
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