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349
If you are rounding to the nearest 70000, you can round down from 10499.
0.6
320
To find the greatest number that can be rounded off to 864.7, we need to consider the number line. When rounding a number to the nearest tenth, we look at the digit in the hundredths place. For 864.7, the digit in the hundredths place is 4. To round up to 864.7, the digit in the hundredths place must be 5 or greater. Therefore, the greatest number that can be rounded off to 864.7 is 864.74.