Let's calculate 1999 x 2623
1999 × 2623 = 2623 × (1999)
+ 2623 × 9 that is equal 23607
+ 2623 × 90 that equals 236070
+ 2623 × 900 that is equal 2360700
+ 2623 × 1000 that results in 2623000

= 5243377
