Question

The area of a square is 800 square meters. The length of its side is between which two numbers?
A 27 m and 28 m
B 28 m and 29 m
C 200 m and 201 m
D 400 m and 401 m

Answer 1

First square 27. Then square 28. You will realize the results are less than 800.
Next square 200. Then square 201. You will realize the results are much higher than 800.

Therefore you need to square 29. Since you already squared 28 you know the answer is 784. 29^2 is 841. Therefore 800 is between 784 and 841.

Your answer is B.