Deductions & credits

I have the same problem an dam curious with the table made. I the table is correct than hypothetically if I had no home for 6 months and bought a 1.5 million dollar home July 1, then my average acquisition would be 750,000 and all muy mortgage interest would be deductible. I thought the correct way would be to get a ratio every single month and multiply by the monthly interest rate - that sum is the deductible amount. Then how do we enter it in turbo tax?