Let's calculate 1251 x 4509
1251 × 4509 = 4509 × (1251)
+ 4509 × 1 that results in 4509
+ 4509 × 50 that results in 225450
+ 4509 × 200 giving us 901800
+ 4509 × 1000 that results in 4509000

= 5640759
