Learn the basics of square roots and how to evaluate the square roots of perfect squares.

Square Roots
$\sqrt{1}=1$ because $1 \times 1=1$ and $1^2=1$
$\sqrt{4}=2$ because $2 \times 2=4$ and $2^2=4$
$\sqrt{9}=3$ because $3 \times 3=9$ and $3^2=9$
$\sqrt{16}=4$ because $4 \times 4=16$ and $4^2=16$
$\sqrt{25}=5$ because $5 \times 5=25$ and $5^2=25$
$\sqrt{36}=6$ because $6 \times 6=36$ and $6^2=36$
$\sqrt{49}=7$ because $7 \times 7=49$ and $7^2=49$
$\sqrt{64}=8$ because $8 \times 8=64$ and $8^2=64$
$\sqrt{81}=9$ because $9 \times 9=81$ and $9^2=81$
$\sqrt{100}=10$ because $10 \times 10=100$ and $10^2=100$
$\sqrt{121}=11$ because $11 \times 11=121$ and $11^2=121$
$\sqrt{144}=12$ because $12 \times 12=144$ and $12^2=144$