estimate under root 66 and under root 92 tell me how to do this?

Answer 1

I assume you are asking about square roots. Well, you know that 8^2 = 64, 9^2 = 81 and 10^2 = 100, where ^ means "to the power of". So square root of 66 is a bit more than 8, and square root of 92 is between 9 and 10, probably around 9.5.

Calculator will give you better values, but I assume you're being asked to do this with no calculator help.

Answer 2

8^2 = 64 so 8+ a fractio will get close to sqrt(66)
Try 8.1*8.1 = 65.61 (that's pretty close)
Try 8.12*8.12= 65.9344 . 8.12 is a close estimate of sqrt(66).

sqrt(92) lies between sqrt(81) and sqrt(100)
So start with 9.5*9.5 = 90.25 (too small)
So try 9.6*9.6 = 92.16 ( a wee bit too large but good enough for an estimate).