Round 12.45 to 2 significant figures

12.45 rounded to 2 sig figs is 12

The first 2 significant figures are the 12,

After the 2, the next digit is 4, and this is not up to 5, so we do not round up the 2 to 3, we leave it as 2

12.45 ≈ 12 to 2 significant figures.

Hope this explains it.