1. The number 23.937 is approximately the square root of a whole number. Find that whole number. ___
2. Simplify the expression without using a calculator: $(\sqrt{23})^2 = \_\_\_$.
3. Simplify the expression without using a calculator: $(\sqrt{121})^2 = \_\_\_$.
4. Simplify the expression without using a calculator: $\sqrt{453^2} = \_\_\_$.
5. Simplify the expression without using a calculator: $\sqrt{2}\sqrt{2} = \_\_\_$.
6. Simplify the expression without using a calculator: $(\sqrt{144})^2 = \_\_\_$.
7. The number 9.220 is approximately the square root of a whole number. Find that whole number. ___
8. The number 12.961 is approximately the square root of a whole number. Find that whole number. ___
9. Simplify the expression without using a calculator: $(\sqrt{147})(\sqrt{147}) = \_\_\_$.
10. Solve the equation for the positive value of $h$: $h^2 = 0.04$. $h = \_\_\_$.