No problem, we've got 7931 and 2721 to multiply
7931 × 2721 = 2721 × (7931)
+ 2721 × 1 that is equal 2721
+ 2721 × 30 what gives us 81630
+ 2721 × 900 resulting in 2448900
+ 2721 × 7000 yielding 19047000

= 21580251
