Alright, let's work through 3500 times 1891 step by step
3500 × 1891 = 1891 × (3500)
+ 1891 × 0 that is equal 0
+ 1891 × 00 which equals 0
+ 1891 × 500 yielding 945500
+ 1891 × 3000 which equals 5673000

= 6618500
