Question

The Middle Kingdom lasted from about 2050 B.C. To 1670 B.C. How many years was that

Answer 1

380 years as they said it works backwards

Answer 2

380 years.
b.c works backwards because we are working our way up to the year 1.
b.c./b.c.e stands for before the common era. in other words the year 1.
so what you do is you subtract 1670 from 2050. Hope it helps!