No problem, we've got 5121 and 7755 to multiply
5121 × 7755 = 7755 × (5121)
+ 7755 × 1 that equals 7755
+ 7755 × 20 which equals 155100
+ 7755 × 100 giving us 775500
+ 7755 × 5000 which equals 38775000

= 39713355
