We're going to solve 8545 multiplied by 2109
8545 × 2109 = 2109 × (8545)
+ 2109 × 5 that equals 10545
+ 2109 × 40 producing 84360
+ 2109 × 500 that is equal 1054500
+ 2109 × 8000 resulting in 16872000

= 18021405
