Alright, let's work through 2100 times 7544 step by step
2100 × 7544 = 7544 × (2100)
+ 7544 × 0 what gives us 0
+ 7544 × 00 that is equal 0
+ 7544 × 100 that is equal 754400
+ 7544 × 2000 producing 15088000

= 15842400
