Respuesta :

Answer:

Step-by-step explanation:

13.5 * 12.1 =??? this seem difficult to do w/o writing it down

13.5 *10 + 13.5 *2 + 13.5 * 0.1= ???

135 + 27 + 1.35 = 163.35 ... much easier to regroup and multiply  :P