No problem, we've got 9138 and 7891 to multiply
9138 × 7891 = 7891 × (9138)
+ 7891 × 8 yielding 63128
+ 7891 × 30 that is equal 236730
+ 7891 × 100 resulting in 789100
+ 7891 × 9000 what gives us 71019000

= 72107958
