The script says 1.25, but the surrounding explanation never makes clear whether it is a measurement, a version or a time. A narrator should not have to decide that meaning while recording.
Expand the ambiguous number
Write the intended spoken form in the working script and keep the original figure nearby for checking. Include the unit. A year, an identifier and a quantity can use different reading conventions, so do not apply one rule to every string of digits.
Listen to the whole sentence
Read the sentence aloud at the intended pace. Does the listener know what the number measures before another figure arrives? If several values appear together, reorganise the explanation or provide a supporting written table rather than rushing through them.
Check the spoken version against the source before recording the final take. This is especially important when changing a long number into a rounded expression: the rounding becomes an editorial decision. The goal is a clear, accurate sentence that a listener can follow without seeing the typography that originally helped the writer.