Let's calculate 1257 x 4302
1257 × 4302 = 4302 × (1257)
+ 4302 × 7 which equals 30114
+ 4302 × 50 that results in 215100
+ 4302 × 200 that results in 860400
+ 4302 × 1000 giving us 4302000

= 5407614
