425-245= 180
To ascend means to move towards the surface, so you would subtract 245 from 425 to get 180. The depth of the submarine is now 180 ft.
Do you want to say that you want division questions?? Here are some.
Find the quotient and remainder if any:
(i) 53 ÷ 7
(ii) 27 ÷ 6
(iii) 78 ÷ 9
(iv) 51 ÷ 3
(v) 86 ÷ 4
(vi) 93 ÷ 8
(vii) 88 ÷ 5
(viii) 95 ÷ 9