I have always been told that Avrohom Ovinu was born 1948 years after Odom was created. I recently thought I would add up the relevant figures in Sidra Bereisis and Sidra Noach to see what number I would end up with. I followed the logic that Odom begot Sheis at 130 (Gen. 5:3) and Sheis begot Enosh when he was 105 (5:6) making it 235, etc. For example, the posuk (5:32) says that Noach begot Sheim (Chom and Yefes) when he was 500 so I added 500 on to 1056 and got 1556.

Somehow, I ended up with Avrohom being born at 1946 and not 1948. I redid this calculation several times and then on an excel spreadsheet and realized that there aren't any differences between the numbers I put in and the numbers the Toroh says.

I looked up this query on google and found that on [this Wikipedia page](https://en.wikipedia.org/wiki/Timeline_of_Genesis_patriarchs) it says that Avrohom was born in 1948 but that it should be 1946.

**Why is there this discrepancy of figures and when was Avrohom actually born - 1948 or 1946?**