Alright, let's work through 6420 times 1401 step by step
6420 × 1401 = 1401 × (6420)
+ 1401 × 0 that equals 0
+ 1401 × 20 what gives us 28020
+ 1401 × 400 that is equal 560400
+ 1401 × 6000 that results in 8406000

= 8994420
