Alright, let's work through 5705 times 1521 step by step
5705 × 1521 = 1521 × (5705)
+ 1521 × 5 yielding 7605
+ 1521 × 00 what gives us 0
+ 1521 × 700 yielding 1064700
+ 1521 × 5000 producing 7605000

= 8677305
