Alright, let's work through 3515 times 60 step by step
3515 × 60 = 60 × (3515)
+ 60 × 5 that equals 300
+ 60 × 10 that is equal 600
+ 60 × 500 that results in 30000
+ 60 × 3000 giving us 180000

= 210900
