No problem, we've got 1142 and 7145 to multiply
1142 × 7145 = 7145 × (1142)
+ 7145 × 2 which equals 14290
+ 7145 × 40 what gives us 285800
+ 7145 × 100 yielding 714500
+ 7145 × 1000 which equals 7145000

= 8159590
