No problem, we've got 6436 and 4255 to multiply
6436 × 4255 = 4255 × (6436)
+ 4255 × 6 which equals 25530
+ 4255 × 30 that equals 127650
+ 4255 × 400 giving us 1702000
+ 4255 × 6000 that equals 25530000

= 27385180
