We're going to solve 4945 multiplied by 4020
4945 × 4020 = 4020 × (4945)
+ 4020 × 5 that is equal 20100
+ 4020 × 40 yielding 160800
+ 4020 × 900 that equals 3618000
+ 4020 × 4000 that is equal 16080000

= 19878900
