To find the estimate of \sqrt(68) what two square roots should you use?
A. \sqrt(49) and \sqrt(64)
B. \sqrt(64) and \sqrt(81)
C. \sqrt(67) and \sqrt(69)
D. \sqrt(64) and \sqrt(69)
The answer is B. √64 and √81.
We can narrow down the estimate by finding the perfect squares closest to 68.
The perfect square closest to 68 less than 68 is 64, and the perfect square closest to 68 greater than 68 is 81.
Taking the square roots of 64 and 81 would give us a range for the estimate of √68.