Alright, let's work through 3870 times 5331 step by step
3870 × 5331 = 5331 × (3870)
+ 5331 × 0 producing 0
+ 5331 × 70 that equals 373170
+ 5331 × 800 producing 4264800
+ 5331 × 3000 that equals 15993000

= 20630970
