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If you are rounding to the nearest centimetre, 273 millimetres does indeed round to 27 centimetres.
273 to the nearest ten is 270.
200
To express 273 to one significant figure, you round it to the nearest ten. The first significant figure is 2, and since the digit following it (7) is 5 or greater, you round up. Therefore, 273 to one significant figure is 300.
100
273
It is 300 because 70 is greater than 50
Well, isn't that a happy little number! When we round 273 to the nearest ten, it becomes 270. See how we're just adjusting a bit to make it more comfortable and easier to work with? Just like adding a touch of highlight to a painting to make it shine!
It is 273/1It is 273/1It is 273/1It is 273/1
Well, darling, 273 rounded to the nearest 1000 is still 0. Because when you're playing in the big leagues of thousands, 273 doesn't even make the cut. So, keep dreaming big, honey, but 273 stays put in the hundreds club.
The volume will be 5723 assuming that the balloon's elasticity makes no difference.