Alright, let's work through 3990 times 8188 step by step
3990 × 8188 = 8188 × (3990)
+ 8188 × 0 that equals 0
+ 8188 × 90 that equals 736920
+ 8188 × 900 what gives us 7369200
+ 8188 × 3000 that is equal 24564000

= 32670120
