$\frac{36x^2}{36}=x^2$
$\frac{5}{36}=\frac{5\ast <!--\; \ast \; -->x^2}{36\ast <!--\; \ast \; -->x^2}=\frac{5x^2}{36x^2}$
 ‌
$\frac{36x^2}{x^2}=36$
$\frac{2}{x^2}=\frac{2\ast <!--\; \ast \; -->36}{x^2\ast <!--\; \ast \; -->36}=\frac{72}{36x^2}$
 ‌
$\frac{36x^2}{3x}=12x$
$\frac{11}{3x}=\frac{11\ast <!--\; \ast \; -->12x}{3x\ast <!--\; \ast \; -->12x}=\frac{132x}{36x^2}$
 ‌
$\frac{36x^2}{9x^2}=4$
$\frac{7}{9x^2}=\frac{7\ast <!--\; \ast \; -->4}{9x^2\ast <!--\; \ast \; -->4}=\frac{28}{36x^2}$
 ‌
$\frac{36x^2}{4x}=9x$
$\frac{1}{4x}=\frac{1\ast <!--\; \ast \; -->9x}{4x\ast <!--\; \ast \; -->9x}=\frac{9x}{36x^2}$

$\frac{20x^{2}y}{20y}=x^2$
$\frac{1}{20y}=\frac{1\ast <!--\; \ast \; -->x^2}{20y\ast <!--\; \ast \; -->x^2}=\frac{x^2}{20x^{2}y}$
 ‌
$\frac{20x^{2}y}{x^2}=20y$
$\frac{5}{x^2}=\frac{5\ast <!--\; \ast \; -->20y}{x^2\ast <!--\; \ast \; -->20y}=\frac{100y}{20x^{2}y}$
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$\frac{20x^{2}y}{20}=x^{2}y$
$\frac{7}{20}=\frac{7\ast <!--\; \ast \; -->x^{2}y}{20\ast <!--\; \ast \; -->x^{2}y}=\frac{7x^{2}y}{20x^{2}y}$
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$\frac{20x^{2}y}{2x}=10xy$
$\frac{11}{2x}=\frac{11\ast <!--\; \ast \; -->10xy}{2x\ast <!--\; \ast \; -->10xy}=\frac{110xy}{20x^{2}y}$
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$\frac{20x^{2}y}{5xy}=4x$
$\frac{3}{5xy}=\frac{3\ast <!--\; \ast \; -->4x}{5xy\ast <!--\; \ast \; -->4x}=\frac{12x}{20x^{2}y}$