No problem, we've got 2683 and 7830 to multiply
2683 × 7830 = 7830 × (2683)
+ 7830 × 3 that equals 23490
+ 7830 × 80 resulting in 626400
+ 7830 × 600 which equals 4698000
+ 7830 × 2000 what gives us 15660000

= 21007890
