Round 2.6 to the nearest tenth

2.6 is already rounded to the nearest tenth.

If the original answer was 2.67345, it would be rounded to 2.7.

or

if it were 2.63421; it would be 2.6

The number after a decimal; (2.6 is the tenth)

816.45 = hundred

816.45 = ten

816.45 = one

816.45 = tenth

816.45 = hundredth