We're going to solve 3872 multiplied by 5428
3872 × 5428 = 5428 × (3872)
+ 5428 × 2 what gives us 10856
+ 5428 × 70 yielding 379960
+ 5428 × 800 yielding 4342400
+ 5428 × 3000 what gives us 16284000

= 21017216
