No problem, we've got 7428 and 2840 to multiply
7428 × 2840 = 2840 × (7428)
+ 2840 × 8 producing 22720
+ 2840 × 20 that results in 56800
+ 2840 × 400 that is equal 1136000
+ 2840 × 7000 that results in 19880000

= 21095520
