Answer :
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.
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.