Question

8)calcule: a)mmc(14,21)

Answer 1

14 = 2 * 7
21 = 3 * 7
mmc = termos comuns ( 7 )  e não comuns ( 2 e 3 ) com maior expoente
mmc = 2 * 3 * 7 = 42 ****

Answer 2

$\large\boxed{\begin{array}{l}\begin{array}{rr|l}\sf14&\sf21&\sf2\\\sf7&\sf21&\sf3\\\sf7&\sf7&\sf7\\\sf1&\sf1&\!\!\!\overline{~\:\sf2\cdot3\cdot7=42~}\end{array}\\\\\sf MMC(14,21)=42~\checkmark\end{array}}$