No problem, we've got 9902 and 7780 to multiply
9902 × 7780 = 7780 × (9902)
+ 7780 × 2 producing 15560
+ 7780 × 00 what gives us 0
+ 7780 × 900 that is equal 7002000
+ 7780 × 9000 producing 70020000

= 77037560
