Alright, let's work through 3515 times 637 step by step
3515 × 637 = 637 × (3515)
+ 637 × 5 that equals 3185
+ 637 × 10 what gives us 6370
+ 637 × 500 that equals 318500
+ 637 × 3000 producing 1911000

= 2239055
