We're going to solve 3990 multiplied by 7790
3990 × 7790 = 7790 × (3990)
+ 7790 × 0 that is equal 0
+ 7790 × 90 producing 701100
+ 7790 × 900 resulting in 7011000
+ 7790 × 3000 what gives us 23370000

= 31082100
