Let's calculate 4640 x 4372
4640 × 4372 = 4372 × (4640)
+ 4372 × 0 that is equal 0
+ 4372 × 40 that is equal 174880
+ 4372 × 600 what gives us 2623200
+ 4372 × 4000 that is equal 17488000

= 20286080
