No problem, we've got 3987 and 2124 to multiply
3987 × 2124 = 2124 × (3987)
+ 2124 × 7 that equals 14868
+ 2124 × 80 that is equal 169920
+ 2124 × 900 what gives us 1911600
+ 2124 × 3000 that equals 6372000

= 8468388
