Alright, let's work through 8521 times 7890 step by step
8521 × 7890 = 7890 × (8521)
+ 7890 × 1 giving us 7890
+ 7890 × 20 which equals 157800
+ 7890 × 500 giving us 3945000
+ 7890 × 8000 giving us 63120000

= 67230690
