Alright, let's work through 7928 times 9790 step by step
7928 × 9790 = 9790 × (7928)
+ 9790 × 8 which equals 78320
+ 9790 × 20 that is equal 195800
+ 9790 × 900 which equals 8811000
+ 9790 × 7000 that equals 68530000

= 77615120
