What are the square roots from 1 to 20?

Other than the perfect squares (1, 4, 9, 16) the square roots are irrational and given rounded to 4 dp:

√1 = 1

√2 ≈ 1.4142

√3 ≈ 1.7321

√4 = 2

√5 ≈ 2.2361

√6 ≈ 2.4495

√7 ≈ 2.6458

√8 ≈ 2.8284

√9 = 3

√10 ≈ 3.1623

√11 ≈ 3.3166

√12 ≈ 3.4641

√13 ≈ 3.6056

√14 ≈ 3.7417

√15 ≈ 3.8730

√16 = 4

√17 ≈ 4.1231

√18 ≈ 4.2426

√19 ≈ 4.3589

√20 ≈ 4.4721