Respuesta :

13 marbles x 4=52. Cornel has 52 marbles.
This is 13 x 4 because since he has 4 times as many this will be multiplication.
The answer is 52 marbles since 4 x 10 = 40, 4 x 3 = 12, and 12 + 40 = 52.
Hope this helps!