$$\left. \begin{array} { l } { 15 \times ( 21 \times 8 ) = ( 15 \times 21 ) \times 8 } \\ { 105 \times 32 = 32 \times 105 } \end{array} \right.$$
$\text{true}$
$$315\times 8=15\times 21\times 8\text{ and }105\times 32=32\times 105$$
$$2520=15\times 21\times 8\text{ and }105\times 32=32\times 105$$
$$2520=315\times 8\text{ and }105\times 32=32\times 105$$
$$2520=2520\text{ and }105\times 32=32\times 105$$
$$\text{true}\text{ and }105\times 32=32\times 105$$
$$\text{true}\text{ and }3360=32\times 105$$
$$\text{true}\text{ and }3360=3360$$
$$\text{true}\text{ and }\text{true}$$
$$\text{true}$$
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