No problem, we've got 2420 and 5121 to multiply
2420 × 5121 = 5121 × (2420)
+ 5121 × 0 giving us 0
+ 5121 × 20 that is equal 102420
+ 5121 × 400 that is equal 2048400
+ 5121 × 2000 what gives us 10242000

= 12392820
