No problem, we've got 7783 and 8820 to multiply
7783 × 8820 = 8820 × (7783)
+ 8820 × 3 what gives us 26460
+ 8820 × 80 that equals 705600
+ 8820 × 700 that equals 6174000
+ 8820 × 7000 which equals 61740000

= 68646060
