Alright, let's work through 7103 times 1831 step by step
7103 × 1831 = 1831 × (7103)
+ 1831 × 3 giving us 5493
+ 1831 × 00 producing 0
+ 1831 × 100 what gives us 183100
+ 1831 × 7000 that results in 12817000

= 13005593
