We're going to solve 3820 multiplied by 3620
3820 × 3620 = 3620 × (3820)
+ 3620 × 0 yielding 0
+ 3620 × 20 giving us 72400
+ 3620 × 800 that equals 2896000
+ 3620 × 3000 which equals 10860000

= 13828400
