No problem, we've got 9840 and 8129 to multiply
9840 × 8129 = 8129 × (9840)
+ 8129 × 0 that equals 0
+ 8129 × 40 that equals 325160
+ 8129 × 800 what gives us 6503200
+ 8129 × 9000 that equals 73161000

= 79989360
