Respuesta :
53 = (10 x 5) + 3
7 x 53 = (7 x 5 x 10) + (7 x 3)
7 x 5 x 10 = 35 x 10 = 350
7 x 3 = 21
350 + 21 = 371
7 x 53 = (7 x 5 x 10) + (7 x 3)
7 x 5 x 10 = 35 x 10 = 350
7 x 3 = 21
350 + 21 = 371