We're going to solve 3945 multiplied by 5139
3945 × 5139 = 5139 × (3945)
+ 5139 × 5 that equals 25695
+ 5139 × 40 resulting in 205560
+ 5139 × 900 resulting in 4625100
+ 5139 × 3000 which equals 15417000

= 20273355
