No problem, we've got 8521 and 7931 to multiply
8521 × 7931 = 7931 × (8521)
+ 7931 × 1 which equals 7931
+ 7931 × 20 giving us 158620
+ 7931 × 500 which equals 3965500
+ 7931 × 8000 what gives us 63448000

= 67580051
