Question

what is the best estimate of 26% of 81

Answer 1

26% is about 25% or 1/4
81 is about 80, so
1/4 of 80 = 20

I don't know that it's the "best" estimate, but it is an easy one.

Answer 2

thanks

Answer 3

Read my user

Answer 4

please, no

Answer 5

hehe