We're going to solve 2815 multiplied by 6448
2815 × 6448 = 6448 × (2815)
+ 6448 × 5 that results in 32240
+ 6448 × 10 what gives us 64480
+ 6448 × 800 which equals 5158400
+ 6448 × 2000 that results in 12896000

= 18151120
