Alright, let's work through 3521 times 5940 step by step
3521 × 5940 = 5940 × (3521)
+ 5940 × 1 that results in 5940
+ 5940 × 20 that is equal 118800
+ 5940 × 500 that results in 2970000
+ 5940 × 3000 that equals 17820000

= 20914740
