Rounding .8635 to 1 significant number?

Is it .8?

No. The next digit (6) is greater than 5 so you round up to 9

nope

the 6 bumps it up

it is closer to .9 than to .8

Thank you

Right. I read that as 8.6 so I rounded to 9. It wasn't 8.6. Sorry about that.

To round .8635 to 1 significant figure, you need to consider the first significant digit. In this case, the first significant digit is 8.

To round to 1 significant figure, you need to drop all the digits after the first significant digit and adjust if necessary. If the first digit is 1-4, you keep it as it is. If the first digit is 5-9, you round up to the next higher number.

In this case, since the first significant digit is 8, we keep it. Therefore, rounding .8635 to 1 significant figure would be 0.9, not 0.8.