We're going to solve 1644 multiplied by 1555
1644 × 1555 = 1555 × (1644)
+ 1555 × 4 which equals 6220
+ 1555 × 40 that equals 62200
+ 1555 × 600 which equals 933000
+ 1555 × 1000 what gives us 1555000

= 2556420
