We're going to solve 4181 multiplied by 4945
4181 × 4945 = 4945 × (4181)
+ 4945 × 1 that is equal 4945
+ 4945 × 80 that equals 395600
+ 4945 × 100 that equals 494500
+ 4945 × 4000 yielding 19780000

= 20675045
