Alright, let's work through 5273 times 7643 step by step
5273 × 7643 = 7643 × (5273)
+ 7643 × 3 which equals 22929
+ 7643 × 70 giving us 535010
+ 7643 × 200 that results in 1528600
+ 7643 × 5000 which equals 38215000

= 40301539
