Arrange these from least to greatest 0.098 .820 0.91

0.098,0.820,0.91

You already got it in the right order.

it goes 0.098 then .91 then .820 because the 0.098  the lat number is in the thousandths place.  .91 is in the hundredths place and is greater than .820 because the zero doesn't count and 82 is less than 91.

the first option is the answer.