Alright, let's work through 7870 times 9841 step by step
7870 × 9841 = 9841 × (7870)
+ 9841 × 0 that equals 0
+ 9841 × 70 resulting in 688870
+ 9841 × 800 which equals 7872800
+ 9841 × 7000 that is equal 68887000

= 77448670
