No problem, we've got 1421 and 3984 to multiply
1421 × 3984 = 3984 × (1421)
+ 3984 × 1 that is equal 3984
+ 3984 × 20 that is equal 79680
+ 3984 × 400 resulting in 1593600
+ 3984 × 1000 what gives us 3984000

= 5661264
