No problem, we've got 6925 and 600 to multiply
6925 × 600 = 600 × (6925)
+ 600 × 5 what gives us 3000
+ 600 × 20 yielding 12000
+ 600 × 900 that is equal 540000
+ 600 × 6000 resulting in 3600000

= 4155000
