Alright, let's work through 3987 times 3370 step by step
3987 × 3370 = 3370 × (3987)
+ 3370 × 7 yielding 23590
+ 3370 × 80 resulting in 269600
+ 3370 × 900 yielding 3033000
+ 3370 × 3000 what gives us 10110000

= 13436190
