No problem, we've got 1258 and 3100 to multiply
1258 × 3100 = 3100 × (1258)
+ 3100 × 8 which equals 24800
+ 3100 × 50 giving us 155000
+ 3100 × 200 giving us 620000
+ 3100 × 1000 that is equal 3100000

= 3899800
