3.56 rounded to one decimal place is 3.6
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The first place to the right of the decimal place is tenths
The first numeral to the right of the decimal is the tenths' place.
This is 3.9 when rounded to one dp. Go to the second digit after the decimal place, if this is 5 or more than increase the first decimal place, if it's less than five as in this case, leave the first decimal place as it is.
The tenths place. Tenths place is the first one to the right of the decimal. Then hundredths, thousandths, etc.
When rounding 3.25 to 1 decimal place, you look at the second decimal place, which is 5. Since 5 is equal to or greater than 5, you round up the first decimal place. Therefore, 3.25 rounded to 1 decimal place is 3.3.