One way is trial and error. The square root of 121 is 11. So the square root of 120 is just under that.
10.9 squared is 118.81
10.95 squared is 119.9.
10.954 squared is 119.99 which is close enough for me.
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To work out the square root of 120, you can use a calculator or an online square root calculator. The square root of 120 is approximately 10.95.
12
10.9545
120The answer is 120.
No, it is not. For it to be a perfect square, the square root of it would have to be an integer, but √120 ≈ 10.954. 100 and 121 are perfect squares nearest to 120. ■
It is an irrational number