No problem, we've got 7860 and 1680 to multiply
7860 × 1680 = 1680 × (7860)
+ 1680 × 0 that is equal 0
+ 1680 × 60 giving us 100800
+ 1680 × 800 which equals 1344000
+ 1680 × 7000 giving us 11760000

= 13204800
