Alright, let's work through 2690 times 1688 step by step
2690 × 1688 = 1688 × (2690)
+ 1688 × 0 that is equal 0
+ 1688 × 90 yielding 151920
+ 1688 × 600 that equals 1012800
+ 1688 × 2000 that equals 3376000

= 4540720
