Well, isn't that a happy little question! When we round 6.45 to 1 decimal place, we look at the digit in the second decimal place, which is 5. Since 5 is 5 or greater, we round up the first decimal place to 6. So, 6.45 rounded to 1 decimal place is 6.5.
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It is: (710-645)/645 times 100 = 10.076% rounded to 3 decimal places
It is already in 1 decimal place
1913.0 to 1 decimal place = 1913.0
40.92 to 1 decimal place = 40.9
It is 4.5 rounded to 1 decimal place