Let's calculate 1391 x 1133
1391 × 1133 = 1133 × (1391)
+ 1133 × 1 that is equal 1133
+ 1133 × 90 that results in 101970
+ 1133 × 300 that results in 339900
+ 1133 × 1000 that equals 1133000

= 1576003
