You would end up having ten in each one of the places.
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Oh, dude, when you round 9999.999 to any place, you're basically just asking it to put on its fancy pants and simplify things. So, if you want it to be a bit more chill and round to the nearest whole number, it becomes 10000. But if you're feeling more laid-back and want it to keep it real with just one decimal place, it's 10000.0. It's all about vibes, man.
When rounding 9999.999 to the nearest whole number, it becomes 10000. When rounding to the nearest tenth, it becomes 10000.0. When rounding to the nearest hundredth, it becomes 10000.00. The number remains the same when rounded to any place beyond the thousandth decimal place.
To solve this, you have to consider what the largest and smallest numbers could be to cause the ten thousand's place to round to a 0.404,444 is the largest, because if you round to the ten thousand's place, it will still be 400,000. If any of the 4s becomes a 5, it will round up to 410,000.394,445 is the smallest, because if you round to the ten thousand's place, it will round up to 400,000
The same as any other number. Look one place to the right of the place you want to round up to. If that digit is 4, 3, 2, 1 or 0, get rid of it. If that digit is 5, 6, 7, 8 or 9, increase the place to the left of it by one and get rid of the rest.
1.99 would have to round up to 2.0. Because both of the digits cannot round up any more before going up to the next whole number, you have to round up to 2.0.
0.20
From where I'm sitting, it appears as if "10.5" is already written with one decimal place, and so does not require any further rounding to that degree of precision.