Final answer:
Step 3 is used to remove the repeating part of a decimal when converting it into a fraction.
Step-by-step explanation:
The purpose of Step 3 in the given context is to remove the repeating part of the decimal from the equation. This step is important when converting a repeating decimal into a fraction.
By removing the repeating part, we can find the equivalent fraction without endless decimal places. This allows us to express the number in its simplest form.
For example, if we have the decimal 0.6666..., Step 3 would help us remove the repeating part to get the fraction 2/3, which is the simplified form of the decimal.