'Evaluate the following : `102\ xx\ 106` (ii) `109\ xx\ 107` (iii)`35\ xx\ 37` (iv) `53\ xx\ 55`'

"Evaluate the following :
`102\ xx\ 106`
(ii) `109\ xx\ 107`

(iii)`35\ xx\ 37`
(iv) `53\ xx\ 55`"