Alright, let's work through 7644 times 9939 step by step
7644 × 9939 = 9939 × (7644)
+ 9939 × 4 that is equal 39756
+ 9939 × 40 what gives us 397560
+ 9939 × 600 that is equal 5963400
+ 9939 × 7000 resulting in 69573000

= 75973716
