Respuesta :

210 ⇒ 210 ÷ 30 = 7
Factor: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210.

90  ⇒ 90 ÷ 30 = 3
Factor: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.

The GCF of 210 and 90 is 30.