FTCE General Knowledge Math Practice Test 2026 - Free Practice Questions and Study Guide

To convert a percentage into a decimal, you divide the percentage by 100. In this case, 12 1/2% can be first converted to an improper fraction. The mixed number 12 1/2% is equivalent to 12.5%.

Now, performing the division:

12.5% ÷ 100 = 0.125.

Therefore, 12 1/2% expressed as a decimal is indeed 0.125. This conversion process is a standard technique in mathematics for dealing with percentages, allowing for easier calculations and comparisons.

The other options do not represent the correct decimal equivalent of 12.5% when converted correctly.