Alright, let's work through 3531 times 9920 step by step
3531 × 9920 = 9920 × (3531)
+ 9920 × 1 giving us 9920
+ 9920 × 30 that results in 297600
+ 9920 × 500 what gives us 4960000
+ 9920 × 3000 producing 29760000

= 35027520
