Alright, let's work through 6821 times 661 step by step
6821 × 661 = 661 × (6821)
+ 661 × 1 that is equal 661
+ 661 × 20 that is equal 13220
+ 661 × 800 which equals 528800
+ 661 × 6000 that results in 3966000

= 4508681
