Approximately how many stars are there in the universe?
At least 10 000 000 000 000 000 000 000.
The newest estimates at the total number of galaxies in the universe is about 100,000,000,000 (100 billion)to as much as 5 times that. The average number of per galaxy is variable. The milky way has about 300,000,000,000. There are galaxies that are much smaller and some larger so a good average would be also be about 100 billion.
The number above is 10 sextillion or 10 billion trillion.