Alright, let's work through 7210 times 2790 step by step
7210 × 2790 = 2790 × (7210)
+ 2790 × 0 that equals 0
+ 2790 × 10 that is equal 27900
+ 2790 × 200 giving us 558000
+ 2790 × 7000 yielding 19530000

= 20115900
