No problem, we've got 9780 and 7980 to multiply
9780 × 7980 = 7980 × (9780)
+ 7980 × 0 which equals 0
+ 7980 × 80 resulting in 638400
+ 7980 × 700 what gives us 5586000
+ 7980 × 9000 producing 71820000

= 78044400
