We're going to solve 1861 multiplied by 2801
1861 × 2801 = 2801 × (1861)
+ 2801 × 1 that is equal 2801
+ 2801 × 60 which equals 168060
+ 2801 × 800 that equals 2240800
+ 2801 × 1000 that results in 2801000

= 5212661
