Alright, let's work through 3948 times 7071 step by step
3948 × 7071 = 7071 × (3948)
+ 7071 × 8 that is equal 56568
+ 7071 × 40 what gives us 282840
+ 7071 × 900 that is equal 6363900
+ 7071 × 3000 producing 21213000

= 27916308
