No problem, we've got 7879 and 9120 to multiply
7879 × 9120 = 9120 × (7879)
+ 9120 × 9 what gives us 82080
+ 9120 × 70 yielding 638400
+ 9120 × 800 resulting in 7296000
+ 9120 × 7000 producing 63840000

= 71856480
