No problem, we've got 7851 and 1648 to multiply
7851 × 1648 = 1648 × (7851)
+ 1648 × 1 yielding 1648
+ 1648 × 50 which equals 82400
+ 1648 × 800 that results in 1318400
+ 1648 × 7000 giving us 11536000

= 12938448
