No problem, we've got 8521 and 8000 to multiply
8521 × 8000 = 8000 × (8521)
+ 8000 × 1 that equals 8000
+ 8000 × 20 that equals 160000
+ 8000 × 500 resulting in 4000000
+ 8000 × 8000 resulting in 64000000

= 68168000
