In my math book I got a question saying 1\5 times 8/9. My answer is 1\5 am I correct.THANKS

That can't be right.

(1/5) * (8/9) = 8/45

It said to estimate

Yes -- 1/5 would be a good estimate.

What about if I did 5/8 times 1/9y answer is 1/9 am I correct

No. Are you supposed to estimate?

Yes

I'd estimate half of 1/9 >> 1/18