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To round 6.875 to the nearest tenth, look at the digit in hundredth's place. If it is 5 or greater, round the digit in tenth's place to the next higher digit. If the digit in the hundredth's place is less than 5, do not change the digit in tenth's place. 6.875 rounded to the nearest tenth is 6.9.
To round 1.5909 to the nearest tenth, you would look at the digit in the hundredth's place, which is 9 in this case. Since 9 is 5 or greater, you would round up the digit in the tenth's place. Therefore, 1.5909 rounded to the nearest tenth is 1.6.
To round off 76.5 to the nearest tenth, you need to look at the digit in the hundredths place, which is 5. Since 5 is equal to or greater than 5, you round up the digit in the tenths place. Therefore, 76.5 rounded to the nearest tenth is 76.6.
To round 31.40 to the nearest tenth, we look at the hundredth place, which is '0'. Since '0' is less than 5, we do not round up. Therefore, 31.40 rounded to the nearest tenth is 31.4.