No problem, we've got 7990 and 1158 to multiply
7990 × 1158 = 1158 × (7990)
+ 1158 × 0 what gives us 0
+ 1158 × 90 which equals 104220
+ 1158 × 900 producing 1042200
+ 1158 × 7000 producing 8106000

= 9252420
