In digital time H.MM, the number before the decimal is the hour.<br><br>
&bull; 4.13 means 13 minutes have passed since 4 o'clock.<br>
&bull; "13 minutes past ___" tells us the hour is the one the minutes are past.<br>
&bull; So 4.13 is 13 minutes past 4.<br><br>
Final Answer: 4