We're going to solve 3978 multiplied by 6690
3978 × 6690 = 6690 × (3978)
+ 6690 × 8 giving us 53520
+ 6690 × 70 which equals 468300
+ 6690 × 900 resulting in 6021000
+ 6690 × 3000 yielding 20070000

= 26612820
