I believe 'half four' is characteristic of British English.
There are other ways to say this, eg 4.30 (said as as 'four-thirty').
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To write 10 past four in digital time, you would write it as 4:10. In digital time format, the hour is written first, followed by a colon, and then the minutes. So, 4:10 represents 10 minutes past the hour of 4 o'clock.
A digital clock will have the greatest sum if added up at nine fifty nine. That would be three digits, not four.
Four minus one and a half is two and a half: 4 - 1.5 = 2.5