Alright, let's work through 2811 times 3561 step by step
2811 × 3561 = 3561 × (2811)
+ 3561 × 1 giving us 3561
+ 3561 × 10 what gives us 35610
+ 3561 × 800 producing 2848800
+ 3561 × 2000 that equals 7122000

= 10009971
