64, 81, 100
1
25 spuares
26 of them, starting with 29² up to 54².
To start you off here's a hint: 144 = 122...
To find the perfect squares between 20 and 150, we need to determine the perfect squares less than 20 and the perfect squares greater than 150. The perfect squares less than 20 are 1, 4, 9, and 16. The perfect squares greater than 150 are 169 and 196. Therefore, there are 5 perfect squares between 20 and 150: 25, 36, 49, 64, and 81.
7^2=49 < 50 < 8^2=64 < 9^2=81 < 10^2=100 < 110 < 11^2=121 so there are 3 perfect squares greater than 50 and less than 100 viz. 64, 81 and 100.
There are 41 square numbers less than 1694 and an infinite number greater than 5929. There are 35 square numbers between 1694 and 5929, 36 if you count 5929 itself.
None. √1976 is "44 and a bit" → first perfect square ≥ 1976 is 452 = 2025 As 1976 is not a perfect square and the first perfect square greater than 1976 is 2025, and 2025 is greater than 2013, there are no perfect squares from 1976 to 2013.
There are two perfect numbers, 6 and 28, that are less than 100.
The question cannot be answered because is does not specify great than what or less than what. Greater then -5 and less then -5 make no sense.
The prime numbers that are greater than 80 and less than 100 are 83, 89, and 97.
Twelve numbers exactly are greater than 76 and less than 89.