If 7/8 is muiltiplied by 4/5, will the product be greater than either of the two factors?

No it won't be big it would be less from both because 7/8 = 0.875 and 4/5 = 0.8 which together 7/8 x 4/5 = 7/10 and 7/10 = 0.7 so yes it will be less if they were to be multiplied