Alright, let's work through 4520 times 5142 step by step
4520 × 5142 = 5142 × (4520)
+ 5142 × 0 giving us 0
+ 5142 × 20 giving us 102840
+ 5142 × 500 producing 2571000
+ 5142 × 4000 which equals 20568000

= 23241840
