the Factors of 55 and 88 are 1 and 11
And there is a + there so i don't understand if u need them added or not 55+88 is 143 but Most likely u didn't mean the + u ment 55 and 88 :) I'm glad i could help comment if u need anything else have a great day and thanks for using Brainly :)

DarlineHamernik

Factors;-
55 = 1, 5, 11, 55
88 = 1, 2, 4, 8, 11, 22, 44, 88
The GCF of these numbers is 11.
55 + 88 = 143