Сравни.
40500 $мм^2$ и 4 $дм^2$ 50 $см^2$;
40500 $м^2$ и 40 га 5 а;
40500 $дм^2$ и 4 а 5 $м^2$;
40500 $см^2$ и 4 $м^2$ 500 $см^2$.

40500 $мм^2$ < 4 $дм^2$ 50 $см^2$
40500 $мм^2$ < (4 * 10000 + 50 * 100) $мм^2$
40500 $мм^2$ < (40000 + 5000) $мм^2$
40500 $мм^2$ < 45000 $мм^2$
40500 $м^2$ < 40 га 5 а
40500 $м^2$ < (40 * 10000 + 5 * 100) $м^2$
40500 $м^2$ < (400000 + 500) $м^2$
40500 $м^2$ < 400500 $м^2$
40500 $м^2$ < 400500 $м^2$
40500 $дм^2$ = 4 а 5 $м^2$
40500 $дм^2$ = (4 * 100 + 5) $м^2$
40500 $дм^2$ = 405 $м^2$
40500 $дм^2$ = (405 * 100) $дм^2$
40500 $дм^2$ = 40500 $дм^2$
40500 $см^2$ = 4 $м^2$ 500 $см^2$
40500 $см^2$ = (4 * 10000 + 500) $см^2$
40500 $см^2$ = (40000 + 500) $см^2$
40500 $см^2$ = 40500 $см^2$