85
1/10 * 850
= 0.1 * 850
= 85
0.05
85
0.85
2.7
2.54 is rounded for 3. That's because its tenth decimal place is 5 or more, so that whole number should be up once without those decimals. If its tenth decimal place is under 5, that it should have that decimal staying as the same, but without its decimals.
85
85
0.05
1.1
0.1
0.1 x 0.1 = 0.01
85
1/10 = 0.1
Decimals are tenth parts. E.g. one tenth of a metre can be written with a decimal: 0.1 m.
Rounded to the nearest tenth, there can be only one decimal. And that is 7.8
0.1
850.0