How many perfect squares lie between 10,000 and 20,000 (inclusive)?
Show answer & explanation
Correct answer: B
Explanation
Range = 10,000 to 20,000 (inclusive)
If n² is a perfect square, then n = √number
√10,000 = 100
√20,000 ≈ 141.42
Therefore, perfect squares range from 100² to 141².
Counting number = 141 − 100 + 1 = 42