Alright, let's work through 7636 times 5978 step by step
7636 × 5978 = 5978 × (7636)
+ 5978 × 6 that is equal 35868
+ 5978 × 30 that results in 179340
+ 5978 × 600 what gives us 3586800
+ 5978 × 7000 which equals 41846000

= 45648008
