Let's calculate 6442 x 4220
6442 × 4220 = 4220 × (6442)
+ 4220 × 2 that results in 8440
+ 4220 × 40 which equals 168800
+ 4220 × 400 that results in 1688000
+ 4220 × 6000 that equals 25320000

= 27185240
