The correct math is [750K/(450K + 400K)] * (11k + 10K). I'll use Publication 936, Table 1 for reference.
In your situation your qualified loan limit is $1M (lines 3 and 4) or the average balance of loan one (lines 2, 5, 6) whichever is less but not less than $750K (lines 8, 9, 11). That loan limit (line 11) is then divided by the total of the average balances (line 12) on your loans. The resulting ratio (line 14) is multiplied by the total interest paid (line 13) to arrive at your mortgage interest deduction (line 15).
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