Alright, let's work through 1251 times 4090 step by step
1251 × 4090 = 4090 × (1251)
+ 4090 × 1 what gives us 4090
+ 4090 × 50 yielding 204500
+ 4090 × 200 what gives us 818000
+ 4090 × 1000 yielding 4090000

= 5116590
